Have you seen someone blowing on their spectacles to wipe them clean? How does the

air from the mouth help in cleaning the spectacles?

Take a glass. Bring it near your mouth and blow hard on it. Do this two or three times.

Does the glass look hazy?

Can you make a mirror hazy in the same way? Can you tell by touching the mirror what made it hazy? Is the air you blew from your mouth dry or wet?

Put your hand on your chest. When you breathe in, does your chest come out or go in.

Measure your chest

– Take a deep breath in

– Ask your friend to measure your chest with a thread.

Measurement

– Now breathe out. Again ask your friend to measure your chest. Measurement

– Was there any difference in the two measurements of your chest?

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Solution

Disclaimer: The purpose of this question is to introduce the children to the method of science. This involves certain prior imagination followed by experimentation and logical deductions. Considering the sustenance of this process of imagination and experimentation the answer to this question has not been provided.

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Similar questions

Miya Balishtiye was confused when he saw the woodcutter blowing on his cold hands to make them warm and on the hot potatoes to cool them.

Put your finger under your nose. Can you feel any air when you breathe out from your nose?

– Count how many times in one minute do you breathe in and breathe out.

– Jump 30 times. Did you feel breathless?

– Now again count how many times in one minute you breathed in and out.

– What was the difference in your count before and after jumping.

Sonu was feeling very cold. He kept blowing on to his hands. Now think and write, which will be cooler – Sonu’s hands or his breath?

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