---
title: "NCERT Solutions for Class 8 Science Chapter 7 Exercise 7.9"
url: https://www.swavid.com/science/class/8/chapter/particulate-nature-of-matter/ncert-solutions/exercise-7-9
dateModified: 2026-10-07T16:14:45+00:00
---

# NCERT Solutions for Class 8 Science Chapter 7 Exercise 7.9

Chapter 7: Particulate Nature of Matter. Every question from Exercise 7.9, with full working and the final answer.

Free PDF (13 pages): https://www.swavid.com/api/seo/pdf/ncert/science/class-8/swavid-ncert-solutions-class-8-science-chapter-7-particulate-nature-of-matter-7cb91bb328.pdf

## Activity 7.9: Let us find out

### Question 1

*Activity*

Do you notice the fragrance from a distance?

**Solution**

1. When an incense stick is lit in one corner of the room, the fragrance is initially felt only around the stick.
2. With the passage of time, the fragrance spreads and can be smelled from a distance throughout the room.
3. This activity demonstrates that gas particles are in constant motion and mix with air particles to fill the entire space.

**Answer:** Yes, the fragrance can be noticed from a distance as gas particles spread throughout the room due to constant motion.

## Related pages

- [All Chapter 7 NCERT solutions](https://www.swavid.com/science/class/8/chapter/particulate-nature-of-matter/ncert-solutions)
- [Exercise 7.1](https://www.swavid.com/science/class/8/chapter/particulate-nature-of-matter/ncert-solutions/exercise-7-1)
- [Exercise 7.2](https://www.swavid.com/science/class/8/chapter/particulate-nature-of-matter/ncert-solutions/exercise-7-2)
- [Exercise 7.3](https://www.swavid.com/science/class/8/chapter/particulate-nature-of-matter/ncert-solutions/exercise-7-3)
- [Exercise 7.4](https://www.swavid.com/science/class/8/chapter/particulate-nature-of-matter/ncert-solutions/exercise-7-4)
- [Exercise 7.6](https://www.swavid.com/science/class/8/chapter/particulate-nature-of-matter/ncert-solutions/exercise-7-6)
- [Exercise 7.7](https://www.swavid.com/science/class/8/chapter/particulate-nature-of-matter/ncert-solutions/exercise-7-7)
- [Exercise 7.8](https://www.swavid.com/science/class/8/chapter/particulate-nature-of-matter/ncert-solutions/exercise-7-8)

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