Question

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.

Answer 1

Materials Required:

• A transparent jar
• A big rubber balloon or piece of stretchable rubber sheet
• A string
• Few chickpeas, black gram, or dry green peas

Steps to Make the Model:

1. Prepare the Jar:

   • Take a transparent jar and put the dried seeds (chickpeas, black gram, or dry green peas) into the jar. These seeds will represent the particles.

2. Attach the Rubber Sheet:

   • Sew a string to the centre of the rubber balloon or rubber sheet.
   • Secure the string tightly using some tape to ensure it stays attached.
   • Stretch the rubber sheet over the mouth of the jar and tie it securely. This setup allows the rubber sheet to simulate the movement when the string is pulled.

3. Demonstrating Particle Movement:

   • Your model is now ready.
   • Gently pull the string attached to the rubber sheet and observe the movement of the seeds inside the jar.
   • Start by tugging the string slowly to demonstrate the movement of particles in solids, where they move slightly.
   • Then, pull the string more vigorously to demonstrate the movement of particles in liquids and gases, where they move more freely and rapidly.

This model effectively shows how particles in solids, liquids, and gases behave differently depending on the energy (represented by the speed of string pulling) applied to them.