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प्रश्न
Fold a piece of cloth 3-4 times. Now bring it close to your mouth and blow hard on it. Did the cloth become warm?
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उत्तर
Yes, the cloth has become warm.
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संबंधित प्रश्न
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.
- Now put your hands at some distance from your mouth, and blow again. Does the air from your mouth feel warm? Why?
Balishtiye saw that the woodcutter was trying to cool the hot potatoes by blowing on them. What would have happened if he had eaten the potatoes without cooling them?
Have you ever burnt your tongue when you ate or drank something that was too hot? How do you cool some food when it is too hot?
For what other things do you blow air from your mouth?
Can you name some things which produce melodious or pleasing sounds when we blow into them?
Put your hand on your chest. When you breathe in, does your chest come out or go in.
Jump 30 times. Did you feel breathless?
You have all heard the ‘tick tick’ of the clock. Have you seen a doctor using a stethoscope to listen to our chest? What do you think she hears? Where is the sound coming from? Is there a clock inside your chest that keeps ticking away?
Stand with this snake below a fan. Look in which direction it moves. Take this paper snake to different places and observe its movement.
Can you understand from the movement of the snake - if the air is moving upwards or downwards?
