NCERT Class 9 Science Textbook for Blind and Visually Impaired Students made Screen Readable by Professor T K Bansal.

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 chick-peas 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.

Figure 1.10B. A model for converting a solid to liquid, and a liquid to gas.

“Image Description by Dr T K Bansal begins: This figure has three parts; Part 1 shows a transparent jar. Part 2 shows a rubber balloon or a rubber sheet with a thread. Part 3 shows the transparent beaker with some dried grains in it and the mouth of the beaker is covered with the balloon or the rubber sheet. Image description ends

Thankyou for studying this lesson. I hope you enjoyed it. In case you found any difficulties in this lesson or have any suggestions to improve it, please write to us at ‘blind2Visionary@gmail.com’.

End of the Chapter 1

Finalized on 15 May 2023.