Page 24 - Understanding NCERT Science 09

Group Activity

Prepare a model to demonstrate movement of particles in solids,
liquids and gases.
For making this model you will need
• A transparent jar
• A big rubber balloon or piece of stretchable rubber sheet
• A string
• Few chickpeas or black gram or dry green peas.
How to make?
• Put the seeds in the jar.
• Sew the string to the centre of the rubber sheet and put some
tape to keep it tied securely.
• Stretch and tie the rubber sheet on the mouth of the jar.
• Your model is ready. Now run your fingers up and down the
string by first tugging at it slowly and then rapidly.

Fig. 1.10: A model for converting of solid to liquid and liquid to gas.

MATTER IN OUR SURROUNDINGS 13

Rationalised 2023-24