This activity helps us to understand the physical properties of solid substances or materials. The activity has been taken from the chapter 1 Matter in Our Surroundings Class 9 Science.
class 9
NCERT Class 9 Science Activity 1.3 Explanation
This activity teaches us that particles of matter are in constant motion. The speed of
movement of particles depends upon their physical state whether they are solid or liquid or gaseous.In the previous activity 1.2, we have discussedÂ
Matter in Our Surroundings Activity 1.4 Class 9 Science
This activity explains the movement of particles of different substances in same medium and helps to understand how diffusion takes place at different rates.
Activity 1.7 Class 9 Science
This activity explains how strongly, particles of matter are held in different materials and comparison of strength of intermolecular force between them.