---
title: "NCERT Solutions Class 6 Science A Journey through States of Water"
url: https://www.swavid.com/science/class/6/chapter/a-journey-through-states-of-water/ncert-solutions
dateModified: 2026-10-07T16:03:25+00:00
---

# NCERT Solutions Class 6 Science A Journey through States of Water

This chapter's questions cover the understanding of states of water, evaporation, condensation, and the water cycle. They test students' observations, reasoning, and practical applications of these concepts in daily life.

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## In-text questions

### Question 1

*3 marks · Short answer*

Aavi has a counterview to Thirav. What do you think? Why?

**Solution**

1. Aavi's view that ice and water are the same substance is correct.
2. Ice and water are two different states of the same substance, water.
3. Although they look and feel different, ice can melt into water and water can freeze into ice.

**Answer:** Ice and water are the same substance in different states.

> Common mistake: Thinking ice and water are different substances because of their different hardness.

### Question 2

*3 marks · Short answer*

Do you think Thirav is right? How can you find out?

**Solution**

1. Thirav is not entirely correct to think something gets added to water in the freezer.
2. Water gets converted into ice simply by placing it in a cold environment like a freezer.
3. We can find this out by keeping clean water in a freezer and observing it turn into ice without adding anything.

**Answer:** Thirav is incorrect; water turns into ice by cooling without adding anything.

> Common mistake: Assuming external impurities are added when water freezes.

### Question 3

*3 marks · Short answer*

What can you conclude from the observations?

**Solution**

1. When an ice cube is kept in a cup on a table, it absorbs heat from the surroundings.
2. The solid ice gets converted into liquid water.
3. This shows that solid ice changes into liquid water upon melting.

**Answer:** Ice gets converted into liquid water.

> Common mistake: Writing that ice disappears into air instead of melting into water.

### Question 4

*3 marks · Short answer*

Does this mean that ice and water are the same substance?

**Solution**

1. Yes, ice and water are two forms of the same substance.
2. These different forms are called states of water.
3. They show differences in behaviour, such as water flows and splashes while ice does not.

**Answer:** Yes, ice and water are two different states of the same substance.

> Common mistake: Confusing different states of the same substance as entirely different materials.

### Question 5

*3 marks · Short answer*

Have you ever noticed water in the puddles disappearing? Where does it go? Discuss with your friends.

**Solution**

1. Water in puddles disappears over time when left in the open.
2. The water changes into its gaseous state called water vapour and mixes with the air.
3. This process of conversion of water into its vapour state is called evaporation.

**Answer:** Water disappears from puddles by evaporating into water vapour.

> Common mistake: Believing the water simply vanishes or is completely absorbed by the ground without evaporating.

### Question 6

*3 marks · Short answer*

Where else have you seen water disappearing? Can you think of a possible reason why this happens?

**Solution**

1. Water disappearing from a wet floor after mopping and drying of wet clothes are common examples.
2. Sweat on our body also disappears after some time.
3. The reason for this disappearance is evaporation, where liquid water turns into invisible water vapour and enters the air.

**Answer:** Water disappears during the drying of clothes and mopped floors due to evaporation.

> Common mistake: Failing to connect daily drying processes with the conversion of liquid water to water vapour.

### Question 7

*3 marks · Short answer*

Does the reason you thought earlier to explain water disappearance apply in this case also?

**Solution**

1. Water left on the surface of washed utensils disappears after some time just like puddles.
2. Aavi wonders if water seeps through the surface of the utensils, while Thirav thinks it does not.
3. Thus, the earlier reason of absorption into the ground does not apply to utensils, requiring a new investigation.

**Answer:** No, the earlier reason of absorption into the ground does not apply to utensils because utensils are made of materials like steel which are non-porous.

> Common mistake: Confusing the absorption of water by soil with the drying of water on solid metal utensils.

### Question 8

*3 marks · Short answer*

Thirav thinks that water does not seep through the surface of the utensils. Design an activity to investigate whose idea is correct.

**Solution**

1. Take a tablespoon of water on a steel plate.
2. Observe whether water seeps through to the other side of the plate or not.
3. Keep observing at regular intervals until the water completely disappears, proving that water does not seep through the steel plate but evaporates.

**Answer:** We can conduct Activity 8.2 by taking a tablespoon of water on a steel plate and observing that water does not seep through to the other side, confirming Thirav's idea.

> Common mistake: Concluding that water has seeped through without checking the bottom side of the plate.

### Question 9

*3 marks · Short answer*

What do you infer? Is this activity enough to come to the conclusion that water does not seep through a steel plate?

**Solution**

1. We observe that water does not seep through to the other side of the steel plate.
2. This activity shows that water does not seep through a steel plate.
3. Thus, Thirav's idea that water does not seep through the surface of the utensils is correct.

**Answer:** We infer that water does not seep through a steel plate, proving Thirav's idea is correct.

> Common mistake: Concluding that water vanishes into the plate itself instead of evaporating into the air.

### Question 10

*3 marks · Short answer*

If water does not seep through the steel plate. Then, where has the water gone?

**Solution**

1. When water does not seep through the steel plate, it remains on the surface exposed to air.
2. Over time, this liquid water gets converted into its gaseous state.
3. This gaseous state of water is called water vapour, which mixes with the surrounding air.

**Answer:** The water gets converted into its gaseous state called water vapour and goes into the air.

> Common mistake: Thinking the water simply vanishes without changing its state.

### Question 11

*3 marks · Short answer*

Let us think of another observation where you notice the water disappearing.

**Solution**

1. Another common observation where we notice water disappearing is the drying of wet clothes hung on a clothesline.
2. Water from wet clothes slowly disappears into the air as water vapour.
3. Other examples include the drying of a mopped floor or sweat drying from our body.

**Answer:** Drying of wet clothes is another observation where we notice water disappearing into the air.

> Common mistake: Failing to connect everyday drying processes with the disappearance of water.

### Question 12

*3 marks · Short answer*

While making dosa, we sprinkle some water on the hot pan and it disappears. Where does it go?

**Solution**

1. When water is sprinkled on a hot dosa pan, it receives heat from the pan.
2. Due to the high temperature, the water quickly converts into steam.
3. Steam is actually water vapour, which rises into the air.

**Answer:** The water sprinkled on the hot pan gets converted into steam (water vapour) and disappears into the air.

> Common mistake: Stating that the water is absorbed by the metal pan.

### Question 13

*3 marks · Short answer*

Can you think of other examples of evaporation?

**Solution**

1. Drying of wet clothes in the sun is a common example of evaporation.
2. Mopped floors dry up as water changes into vapour and mixes with the air.
3. Sweat on our body evaporates, taking heat and leaving a cooling sensation.

**Answer:** Examples of evaporation include the drying of wet clothes, drying of a mopped floor, and the evaporation of sweat from our body.

> Common mistake: Confusing evaporation with boiling, even though evaporation happens at all temperatures.

### Question 14

*3 marks · Short answer*

Now what do you think is the reason for the disappearance of water from the puddles? Is it due to: (i) seeping of water into the ground or (ii) evaporation of water or (iii) both of these?

**Solution**

1. Water puddles disappear due to both seeping into the ground and evaporation into the air.
2. Some water is absorbed by the soil on the playground.
3. The remaining water gets converted into water vapour through evaporation and goes into the atmosphere.

**Answer:** The disappearance of water from puddles is due to both of these reasons: seeping of water into the ground and evaporation of water.

> Common mistake: Stating only one of the two processes instead of recognizing that both happen.

### Question 15

*3 marks · Short answer*

Hand sanitiser disappears as you rub it on your hands. What happens to it?

**Solution**

1. Hand sanitiser is a liquid that evaporates very quickly at room temperature.
2. When rubbed on hands, it absorbs heat from the skin and changes into its gaseous state.
3. This rapid evaporation leaves our hands feeling cool.

**Answer:** Hand sanitiser quickly evaporates into the air by absorbing heat from our hands, which is why it disappears and makes our hands feel cool.

> Common mistake: Thinking that sanitiser seeps into the skin instead of evaporating into the air.

### Question 16

*3 marks · Short answer*

Suggest possible reasons explaining the appearance of water droplets on the outer surface of the glass tumbler.

**Solution**

1. The glass tumbler contains cold water and ice cubes, making its outer surface very cold.
2. Water vapour present in the surrounding air comes in contact with this cold surface.
3. The water vapour loses heat and gets converted into tiny liquid water droplets through condensation.

**Answer:** The water droplets appear on the outer surface because the water vapour in the air condenses upon touching the cold glass tumbler.

> Common mistake: Assuming that water has leaked or seeped out from inside the glass tumbler.

### Question 17

*3 marks · Short answer*

Discuss with your friends. Write down the possible reasons in Fig. 8.3.

**Solution**

1. One possible reason discussed is that ice might have come out of the glass tumbler and melted.
2. Another possibility is that water from inside might have seeped through the glass walls.
3. A third possibility is that water droplets are formed from the moisture present in the air surrounding the tumbler.

**Answer:** Possible reasons include ice melting outside, water seeping through the glass, or water vapour from the air condensing on the cold surface.

> Common mistake: Accepting seepage as the correct reason without checking if the water level inside decreases.

### Question 18

*3 marks · Short answer*

What do you think about the possible reasons mentioned in Fig. 8.4?

**Solution**

1. The suggestion that water seeped out is tested by observing that the water level inside the glass does not decrease.
2. Using a tall and narrow bottle makes even a slight change in water level noticeable.
3. Taking water at room temperature in another tumbler further confirms whether any water seeps out through the walls.

**Answer:** The chain of reasoning shows that water does not seep out because the water level inside remains unchanged, proving that the outer droplets come from condensation of air moisture.

> Common mistake: Concurring with seepage without performing comparative checks or level measurements.

### Question 19

*3 marks · Short answer*

Where else have you seen water droplets like this?

**Solution**

1. Water droplets can be seen on the outer surface of a cold water bottle or a glass containing ice cubes.
2. We also see water droplets on cold soft drink cans taken out of a refrigerator.
3. Dew drops on grass and leaves in the early morning are another example.

**Answer:** Water droplets are commonly seen on cold water bottles, cold drink cans, and grass in the morning.

> Common mistake: Confusing evaporation with condensation.

### Question 20

*3 marks · Short answer*

Why do we see dew drops more in the morning?

**Solution**

1. During the night, the ground and plants become cold.
2. When warm air containing water vapour comes in contact with these cold surfaces, it cools down.
3. The water vapour condenses into tiny liquid water droplets, which we see as dew drops in the morning.

**Answer:** Dew drops are seen more in the morning because the air and surfaces are cooler at night, causing water vapour to condense.

> Common mistake: Thinking dew falls from the sky like rain.

### Question 21

*3 marks · Short answer*

When we boil the water in a half-filled utensil and cover it with a steel plate, some water drops accumulate on the inner side of the steel plate. Where do these water drops come from? What do you think?

**Solution**

1. When water is boiled, it changes into water vapour (steam).
2. When this hot water vapour rises and touches the cooler inner side of the steel plate, it cools down.
3. The water vapour gets converted back into liquid water droplets through condensation.

**Answer:** The water drops come from the condensation of steam when it touches the cooler steel plate.

> Common mistake: Stating that water seeps through the metal plate.

### Question 22

*3 marks · Short answer*

Could the water appearing on the outer surface of the glass tumbler in Activity 8.3 also be due to condensation of water vapour present in the air? Let us investigate it.

**Solution**

1. Yes, the water appearing on the outer surface of the glass tumbler is due to condensation.
2. The glass contains cold water and ice, which makes its outer surface cold.
3. When water vapour present in the surrounding air touches this cold surface, it turns into water droplets.

**Answer:** Yes, it is due to the condensation of water vapour from the air on the cold surface of the glass tumbler.

> Common mistake: Believing the water leaked through the glass walls.

### Question 23

*3 marks · Short answer*

Predict what will happen to the mass of cold water kept on the digital weighing balance. Will it increase or decrease or remain the same?

**Solution**

1. The mass of the setup kept on the digital weighing balance will increase over time.
2. Water vapour from the air condenses on the cold outer surface of the glass tumbler and adds to the total mass.
3. Since extra water droplets accumulate on the outside, the total measured mass increases.

**Answer:** The mass will increase because water vapour from the air condenses and collects on the outside of the tumbler.

> Common mistake: Assuming mass remains constant because water inside does not leak.

### Question 24

*3 marks · Short answer*

Do your findings match with your predictions? Explain your observations.

**Solution**

1. Yes, our findings match the prediction that the mass increases.
2. We observe water droplets forming on the outer surface of the glass tumbler.
3. This happens because water vapour from the air comes in contact with the cold surface and gets converted into water droplets through condensation, increasing the total mass.

**Answer:** Findings match predictions; the mass increases due to water vapour condensing on the cold tumbler surface.

> Common mistake: Failing to connect the increase in mass with water vapour from the surrounding air.

### Question 25

*3 marks · Short answer*

Can we conclude that water is not seeping through the wall of the tumbler? Can we also conclude that the water collected outside the tumbler is only due to condensation? No, we cannot say that conclusively from Activity 8.4. What more can you do to show that water is not seeping from the glass tumbler? How would you modify Activity 8.4 to find the answer?

**Solution**

1. We can modify Activity 8.4 by marking the initial water level inside the glass tumbler using a permanent marker or a visible tape.
2. We then observe the water level inside the tumbler and the collection of water droplets on the outer surface after some time.
3. This modification helps us confirm whether the water outside is due to seepage or condensation.

**Answer:** We mark the water level on the glass tumbler with a permanent marker or a visible tape to check if water is seeping through the walls.

> Common mistake: Stating that weighing alone is enough without marking the water level on the container.

### Question 26

*3 marks · Short answer*

What do you observe? Water level in the glass tumbler does not go down but the extra water gets collected on the outer surface of the glass tumbler. What can you conclude from this?

**Solution**

1. We observe that the water level inside the glass tumbler does not go down, while extra water collects on the outer surface.
2. This proves that water is not seeping through the walls of the glass tumbler.
3. We conclude that the extra water collected on the outer surface is entirely due to the condensation of water vapour present in the air.

**Answer:** We conclude that water is not seeping through the glass tumbler and the outer water is collected due to condensation.

> Common mistake: Confusing condensation on the outside with water leaking from the inside.

### Question 27

*3 marks · Short answer*

What changes do you notice in the shape of the ice cube? Record your observations in Table 8.3.

**Solution**

1. When an ice cube is put in one container and transferred to another container of a different shape, its shape does not change.
2. Ice is in the solid state and retains its fixed shape irrespective of the container.
3. Thus, the ice cube maintains its shape and does not take up the shape of the new container.

**Answer:** The shape of the ice cube remains unchanged when transferred to another container because solid ice has a fixed shape.

> Common mistake: Assuming solids take the shape of the container like liquids do.

### Question 28

*3 marks · Short answer*

Observe how water behaves compared to the ice cube and make a record. Did you notice how water flows from one container to the other? What happens to its shape?

**Solution**

1. When water is poured from one container to another, it flows easily and changes its shape.
2. Water does not have a fixed shape like ice.
3. It takes up the shape of the container in which it is kept while keeping its volume constant.

**Answer:** Water flows and takes the shape of the container it is poured into, unlike ice which retains its shape.

> Common mistake: Stating that the volume of water changes when transferred to a different container.

### Question 29

*3 marks · Short answer*

When water gets converted into water vapour, how does this water vapour spread? Compare this with the spreading behaviour of water.

**Solution**

1. Liquid water spreads on a surface while keeping its volume constant.
2. When water gets converted into water vapour in the gaseous state, it exhibits the property of spreading out in the entire available space.
3. Unlike liquid water, water vapour does not have a fixed volume or shape and fills the whole space around it.

**Answer:** Liquid water spreads keeping its volume constant, whereas water vapour spreads out to fill the entire available space.

> Common mistake: Confusing the spreading of liquid water on a surface with the expansion of gases in space.

### Question 30

*3 marks · Short answer*

What are the differences in the properties of water in solid, liquid and gaseous states?

**Solution**

1. In the solid state (ice), water has a fixed shape, does not flow, and retains its shape irrespective of the container.
2. In the liquid state (water), it has no fixed shape, takes the shape of the container, has constant volume, and can flow and spread.
3. In the gaseous state (water vapour), it has no fixed shape or volume and spreads out to fill the entire available space.

**Answer:** Solid ice has a fixed shape and does not flow, liquid water takes the container's shape and flows, and gaseous water vapour spreads out to fill the entire available space.

> Common mistake: Forgetting to mention that liquid volume remains constant while shape changes.

### Question 31

*3 marks · Short answer*

Look around and find some examples of solid substances.

**Solution**

1. Substances that have a fixed shape and do not flow are called solids.
2. Some common examples of solid substances found around us include stones, wood, and glass.
3. Other examples include iron, brick, and plastic.

**Answer:** Examples of solid substances are stones, wood, glass, iron, and brick.

> Common mistake: Confusing liquids or gases with solids by giving incorrect examples.

### Question 32

*3 marks · Short answer*

What are the other examples of liquids you can think of?

**Solution**

1. Substances that flow, change their shape to match their container, and have a fixed volume are called liquids.
2. Examples of liquids mentioned in the textbook include milk and oil.
3. Five more examples of liquids are juice, tea, water, vinegar, and honey.

**Answer:** Examples of liquids are milk, oil, juice, tea, and honey.

> Common mistake: Listing substances that are solids or gases instead of liquids.

### Question 33

*3 marks · Short answer*

Have you ever noticed that you can smell the food being cooked even without entering the kitchen? How does this smell reach us?

**Solution**

1. Gases have the property of spreading out in the entire available space.
2. The smell of food being cooked comes from vapours and gases released during cooking.
3. This smell spreads through the air and reaches our nostrils even if we are not in the kitchen.

**Answer:** The smell of food spreads through the air because gases and vapours can spread out into the entire available space, reaching our nostrils.

> Common mistake: Stating that food particles travel on their own without mentioning the role of air and spreading.

### Question 34

*3 marks · Short answer*

What are the other examples of gases you can think of?

**Solution**

1. Substances that do not possess a fixed shape and spread out in the entire available space are called gases.
2. Examples of gases mentioned in the textbook include oxygen and carbon dioxide.
3. Other examples of gases include nitrogen, water vapour, and cooking gas (LPG).

**Answer:** Examples of gases are oxygen, carbon dioxide, nitrogen, water vapour, and LPG.

> Common mistake: Writing liquids or solids as examples of gases.

### Question 35

*3 marks · Short answer*

How can you quickly change ice to its liquid state, water?

**Solution**

1. Ice is the solid state of water.
2. To change ice into its liquid state (water), we need to supply heat to it.
3. Taking ice out of the freezer into room temperature causes it to melt and convert into water.

**Answer:** We can quickly change ice to water by supplying heat to it, such as by taking it out of the freezer.

> Common mistake: Stating that cooling changes ice to water instead of heating.

### Question 36

*3 marks · Short answer*

If we want to change water into ice, what should be done?

**Solution**

1. Water is in the liquid state at room temperature.
2. To change water into ice (solid state), heat must be removed from it.
3. This is done by placing water in a cold environment, such as the freezer of a refrigerator, where water freezes.

**Answer:** To change water into ice, we should place water in a cold environment such as a freezer so that it freezes.

> Common mistake: Heating water to turn it into ice instead of cooling it.

### Question 37

*3 marks · Short answer*

Can you think of any other example, besides water, that can change from solid to liquid?

**Solution**

1. A candle, which is made of wax, is an example of a substance besides water that can change from a solid to a liquid.
2. When heated, solid wax melts to form liquid wax.
3. Similarly, butter and ghee also change from solid to liquid upon heating.

**Answer:** A candle (wax) is an example of a substance that changes from solid to liquid on heating.

> Common mistake: Naming only water and forgetting that other substances like wax or butter also show state changes.

### Question 38

*3 marks · Short answer*

How can we turn candle wax into liquid state? How can we change the liquid wax back into solid state?

**Solution**

1. We can turn candle wax into the liquid state by supplying heat to it.
2. Heating causes solid wax to melt.
3. We can change the liquid wax back into the solid state by cooling it.

**Answer:** Solid wax is turned into liquid by heating, and liquid wax is turned back into solid by cooling.

> Common mistake: Confusing heating with cooling for melting and freezing processes.

### Question 39

*3 marks · Short answer*

What are the other liquids you have seen which get converted into a solid? Have you ever seen coconut oil getting converted into its solid state during the winter season?

**Solution**

1. Coconut oil is a liquid that gets converted into its solid state during the winter season due to low temperatures.
2. Ghee and butter also change from liquid to solid upon cooling.
3. Water freezes into ice when placed in a cold environment like a freezer.

**Answer:** Coconut oil, ghee, and butter are examples of liquids that convert to solids upon cooling.

> Common mistake: Failing to mention temperature or winter conditions for coconut oil solidification.

### Question 40

*3 marks · Short answer*

Observe your surroundings. What are the conditions that affect how fast water evaporates? What differences do you see in evaporation on a cold day versus a hot day? Discuss with your friends.

**Solution**

1. The conditions that affect how fast water evaporates include exposed area, humidity, air movement, and temperature.
2. On a hot day, water evaporates faster because of higher temperatures, whereas on a cold day, evaporation is slower.
3. Factors like wind and a fan also increase the rate of evaporation.

**Answer:** Evaporation is affected by exposed area, humidity, air movement, and temperature; it is faster on hot days than on cold days.

> Common mistake: Not mentioning temperature differences between hot and cold days.

### Question 41

*3 marks · Short answer*

What can you conclude from this investigation?

**Solution**

1. The investigation shows that water in the plate takes less time to evaporate completely compared to water in the bottle cap.
2. The exposed area of water in a plate is larger than that in a bottle cap.
3. We can conclude that if you spread out water on a plate, its area exposed to air is larger, and therefore evaporation is faster.

**Answer:** Spreading out water increases its exposed area to air, which makes evaporation faster.

> Common mistake: Confusing bottle cap and plate evaporation times.

### Question 42

*3 marks · Short answer*

What would happen if milk is taken instead of water in the above activity?

**Solution**

1. Milk is not a pure substance like water; it contains water along with other dissolved and suspended solids.
2. When milk is kept exposed in a plate, the water content evaporates slowly.
3. Unlike water which evaporates completely leaving nothing behind, milk leaves behind a solid residue or layer of milk solids.

**Answer:** Milk takes longer to evaporate completely and leaves behind solid residues, unlike water.

> Common mistake: Stating that milk will evaporate completely just like water without leaving any residue.

### Question 43

*3 marks · Short answer*

Design an activity similar to Activity 8.7 to find out what are the other conditions which can affect how fast water will evaporate. What would you change? What would you keep the same?

**Solution**

1. We can change the sunlight (temperature) or wind speed to find other conditions affecting evaporation.
2. We must keep the exposed area of water and the initial amount of water the same in both containers.
3. We measure the time taken for water to completely evaporate in each condition.

**Answer:** We change either the sunlight or the wind speed while keeping the exposed area and amount of water the same.

> Common mistake: Changing more than one condition at a time during an investigation.

### Question 44

*3 marks · Short answer*

What conclusions can you draw from Activity 8.8 and other similar experiences?

**Solution**

1. Water evaporates faster from the cap kept in sunlight compared to the cap kept in shade.
2. Higher temperature provided by sunlight increases the rate of evaporation.
3. Movement of air and humidity also affect how fast water evaporates.

**Answer:** Water evaporates faster in sunlight and with increased air movement.

> Common mistake: Confusing evaporation with condensation.

### Question 45

*3 marks · Short answer*

Do clothes dry faster or slower on a windy day?

**Solution**

1. Clothes dry faster on a windy day.
2. With the increase in the movement of air, water evaporates faster.
3. Moving air carries away the water vapour, speeding up the evaporation process.

**Answer:** Clothes dry faster on a windy day because increased air movement increases the rate of evaporation.

> Common mistake: Thinking wind makes things colder without linking it to evaporation.

### Question 46

*3 marks · Short answer*

If you want to dry your clothes on a rainy day, how can you make it faster?

**Solution**

1. On a rainy day, the humidity in the air is high, so clothes dry slowly.
2. We can make drying faster by using a fan to increase air movement.
3. We can also use a heater or iron the clothes to supply extra heat.

**Answer:** We can use a fan or provide heat to make clothes dry faster on a rainy day.

> Common mistake: Ignoring the high humidity on rainy days.

### Question 47

*3 marks · Short answer*

What do you think is the reason for the water in the earthen pot being so cold?

**Solution**

1. Water seeps through the tiny pores in the surface of the earthen pot.
2. This seeped water evaporates from the outer surface of the pot.
3. Evaporation requires heat, which is taken from the water inside the pot, causing it to cool.

**Answer:** Water seeps through the earthen pot and evaporates, which imparts a cooling effect on the remaining water.

> Common mistake: Believing that earthen pots have a built-in refrigeration system.

### Question 48

*3 marks · Short answer*

What are the other examples of cooling effect?

**Solution**

1. Sprinkling water on the floor or the roof during summer to cool it down.
2. Feeling a cooling sensation when we rub hand sanitiser on our hands.
3. Feeling cool when we sit under a fan after sweating.

**Answer:** Sprinkling water on hot surfaces and feeling cool when rubbing hand sanitiser are examples of the cooling effect of evaporation.

> Common mistake: Forgetting that evaporation absorbs heat from the surroundings.

### Question 49

*3 marks · Short answer*

How do you feel when you rub sanitiser on your hands?

**Solution**

1. When we rub sanitiser on our hands, it evaporates quickly by taking heat from our hands.
2. The evaporation of sanitiser imparts a cooling effect on our hands.
3. Therefore, our hands feel cold when we touch or rub sanitiser on them.

**Answer:** We feel a cooling sensation on our hands because the sanitiser evaporates quickly by taking heat from our skin.

> Common mistake: Thinking sanitiser is naturally cold instead of realising it causes cooling due to evaporation.

### Question 50

*3 marks · Short answer*

Observe and discuss how it creates a cooling effect inside the pots. Keep some vegetables and fruits in it and observe for a week on a daily basis to check for the freshness of the vegetables and fruits kept inside the cooler.

**Solution**

1. Water poured in the sand between the two earthen pots seeps through the porous clay and evaporates.
2. The evaporation of water creates a cooling effect inside the inner pot.
3. This continuous cooling keeps the vegetables and fruits fresh inside the cooler for several days.

**Answer:** The water in the sand evaporates continuously, creating a cooling effect inside the pots that helps keep fruits and vegetables fresh.

> Common mistake: Forgetting that water seeps through the porous earthen pots to cause evaporation.

### Question 51

*3 marks · Short answer*

For how many days can the vegetables and fruits be kept fresh in it? What are the conditions which can affect the number of these days? What else can be used in place of sand for better cooling?

**Solution**

1. Fruits and vegetables can typically be kept fresh for a few days to a week depending on conditions.
2. The number of days is affected by ambient temperature, humidity, and regular addition of water to keep the sand moist.
3. Materials like sawdust or porous soil can be used in place of sand for better water retention and cooling.

**Answer:** Fruits and vegetables can stay fresh for about a week; the duration depends on humidity, temperature, and moisture in the sand.

> Common mistake: Not mentioning humidity and temperature as key factors affecting evaporation and freshness.

### Question 52

*3 marks · Short answer*

What will you observe in Activity 8.10?

**Solution**

1. When the bottle containing water with a burnt piece of newspaper is squeezed and released, pressure and temperature changes occur.
2. We observe some haziness resembling clouds forming in the space above the water inside the bottle.
3. The burnt newspaper provides tiny invisible dust particles around which water vapour condenses to form these cloud-like droplets.

**Answer:** We observe haziness (cloud formation) above the water inside the bottle due to water vapour condensing around dust particles from the burnt newspaper.

> Common mistake: Missing the role of dust particles provided by the burnt newspaper in condensation.

### Question 53

*3 marks · Short answer*

Compile the data for the year and study any patterns, if present.

**Solution**

1. Daily humidity data collected from newspapers or other sources over a year can be compiled into tables or graphs.
2. Studying this compiled data helps us observe seasonal patterns in the amount of water vapour present in the air.
3. We generally notice higher humidity during rainy seasons and lower humidity during dry or summer months.

**Answer:** Compiling yearly humidity data reveals seasonal patterns, showing higher humidity during the rainy season and lower humidity during drier months.

> Common mistake: Not relating compiled humidity data to seasonal weather patterns.

## Let us enhance our learning

### Question 1

*1 mark · MCQ*

Which of the following best describes condensation?

- The conversion of water into its vapour state.
- The process of water changing from a liquid into gaseous state.
- The formation of clouds from tiny water droplets.
- The conversion of water vapour into its liquid state.

**Solution**

1. The process of conversion of water vapour into its liquid state is called condensation.
2. Options (i) and (ii) describe evaporation, while option (iii) describes cloud formation caused by condensation but is not the definition of the process itself.

**Answer:** (iv) The conversion of water vapour into its liquid state.

> Common mistake: Confusing evaporation with condensation.

### Question 2

*3 marks · Short answer*

Identify in which of the given processes, evaporation is very important—
(i) Colouring with
(ii) Writing on paper with

**Part (i)**

1. Water colours need evaporation to dry up after being applied to paper.
2. Crayons, acrylic colours, and pencil colours dry by cooling or setting rather than evaporation of water.

Answer (i): (b) water colours

**Part (ii)**

1. Ink pens use liquid ink that contains water or solvents which must evaporate for the written words to dry.
2. Pencils and ballpoint pens do not rely on water evaporation to leave marks.

Answer (ii): (b) ink pen

**Answer:** Evaporation is required for water colours and ink pens to dry after writing or painting.

> Common mistake: Choosing media that do not depend on the drying action of evaporation.

### Question 3

*3 marks · Short answer*

We see green coloured plastic grass at many places these days. Space around natural grass feels cooler than space around the plastic grass. Can you find out why?

**Solution**

1. Natural grass contains water and undergoes natural processes like transpiration and evaporation.
2. When water evaporates from natural grass and the surrounding soil, it absorbs heat from the surroundings and causes a cooling effect.
3. Plastic grass does not contain water and cannot support evaporation, so it does not produce this cooling effect.

**Answer:** Natural grass allows water to evaporate from its surface, which creates a cooling effect, whereas plastic grass does not evaporate water.

> Common mistake: Thinking plastic absorbs heat differently without considering evaporation.

### Question 4

*3 marks · Short answer*

Give examples of liquids other than water that evaporate.

**Solution**

1. Evaporation is not restricted to water alone; other volatile liquids also change into their gaseous states at room temperature.
2. Nail polish remover (acetone) disappears quickly when left open due to evaporation.
3. Hand sanitiser and petrol are other common examples of liquids that evaporate rapidly.

**Answer:** Nail polish remover (acetone), hand sanitiser, and petrol are examples of liquids other than water that evaporate.

> Common mistake: Naming substances that are solids or do not evaporate at room temperature.

### Question 5

*3 marks · Short answer*

Fans move air around, creating a cooling sensation. It might seem strange to use a fan to dry wet clothes since fans usually make things cooler, not warmer. Normally, when water evaporates, it requires heat, not cold air. What do you think about this?

**Solution**

1. Fans do not blow cold air; they simply move the air around us.
2. When a fan blows air over wet clothes or sweaty skin, it increases the movement of air across the surface.
3. Increased air movement makes water evaporate faster, and since evaporation causes a cooling effect, it helps clothes dry quicker.

**Answer:** Fans increase air movement, which speeds up the evaporation of water from wet clothes without needing cold air.

> Common mistake: Assuming that electric fans generate refrigerated or cold air.

### Question 6

*3 marks · Short answer*

Usually, when sludge is removed from drains, it is left in heaps next to the drain for 3–4 days. Afterward, it is transported to a garden or a field where it can be used as manure. This approach reduces transportation cost of the sludge and enhances the safety of individuals handling it. Reflect upon it and explain how.

**Solution**

1. Sludge removed from drains contains a large amount of water and is very heavy and wet.
2. When left in heaps for a few days, the water in the sludge undergoes evaporation in the open air.
3. The loss of water reduces the total weight and volume of the sludge, making it lighter and safer to transport.

**Answer:** Leaving sludge in heaps allows water to evaporate, which reduces its weight and volume, lowering transportation costs and handling risks.

> Common mistake: Forgetting that wet waste loses mass as water evaporates.

### Question 7

*3 marks · Short answer*

Observe the activities in your house for a day. Identify the activities that involve evaporation. How does understanding the process of evaporation help us in our daily activities?

**Solution**

1. Activities in our house that involve evaporation include drying of wet clothes, mopped floors drying, and drying of wet utensils.
2. Understanding evaporation helps us plan daily tasks like drying clothes faster by spreading them out or keeping them in sunlight and wind.
3. It also explains natural phenomena such as cooling effects and the water cycle.

**Answer:** Activities like drying clothes and mopped floors involve evaporation, and understanding it helps us manage daily tasks efficiently.

> Common mistake: Confusing evaporation with boiling.

### Question 8

*3 marks · Short answer*

How is water present in the solid state in nature?

**Solution**

1. In nature, water is present in the solid state as ice, snow, and hail.
2. Snow is formed when water vapour in the cold upper atmosphere freezes into ice crystals.
3. Ice is also found on high mountain peaks and in polar regions.

**Answer:** Water is present in the solid state in nature as ice, snow, and hail found on mountains and in cold regions.

> Common mistake: Mentioning only ice cubes made in freezers instead of natural forms.

### Question 9

*3 marks · Short answer*

Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.

**Solution**

1. Water is essential for life, and its availability for use is limited as most water is in oceans and unfit for direct use.
2. The statement means that before we claim water as our right to use, we have a duty to conserve it and prevent pollution.
3. We must use water wisely, avoid wastage, and keep water bodies clean for future generations.

**Answer:** The statement highlights that we must conserve water and use it wisely before claiming it as our right.

> Common mistake: Writing abstract thoughts without mentioning water conservation and limited usable water.

### Question 10

*3 marks · Short answer*

The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?

**Solution**

1. The hot seat of a two-wheeler can be cooled down by sprinkling water on it.
2. When the water evaporates, it takes heat from the seat surface.
3. This evaporation process imparts a cooling effect and lowers the temperature of the seat.

**Answer:** We can cool down the hot seat by sprinkling water on it, as evaporation of water causes a cooling effect.

> Common mistake: Forgetting to mention that evaporation causes the cooling effect.

## Frequently asked questions

### How many total questions are there in NCERT Solutions for Class 6 Science Chapter 8 A Journey through States of Water?

This chapter includes a total of 63 questions, divided into 53 in-text questions and 10 questions in the Let us enhance our learning section. SwaVid provides comprehensive step-by-step solutions for all these questions on this page.

### Which major concepts are covered in the in-text questions of this chapter?

The in-text questions cover 53 short answer questions based on concepts such as the behavior and shape of liquid water, chain of reasoning on water seepage, and change of solid to liquid. Other topics include condensation on glass tumblers, conditions affecting evaporation, conversion of water to water vapour, and the cooling effect of evaporation.

### What types of questions and topics appear in the Let us enhance our learning section?

This section contains 10 multiple choice and short answer questions focusing on concepts like the condensation definition and the cooling effect of evaporation in plants and daily life. It also explores the effect of air movement on evaporation, evaporation of other liquids, and how evaporation reduces the mass and weight of waste.

### How should students approach difficult reasoning and activity-based questions in this chapter to score full marks?

Students often find chain of reasoning and modified condensation activity questions challenging. To write answers for full marks, one must clearly explain the underlying scientific concepts like phase change and temperature rather than just stating the final outcome.

### Is the free PDF for Class 6 Science Chapter 8 solutions available for the 2026-27 session?

Yes, SwaVid offers a free PDF and detailed step-by-step solutions for this chapter based on the new NCERT book as per the NCF 2023 guidelines for the 2026-27 session right here on this page.

## Related pages

- [Class 6 Science chapters](https://www.swavid.com/science/class/6)

Solutions written by SwaVid, a personal AI tutor for Class 6 to 10 Maths and Science. Practise this chapter free: https://www.swavid.com/start/student