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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?
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उत्तर
When the hands are placed at some distance from the mouth and the air is blown again, this time the air from the mouth does not feel much warmer. This is because, due to the distance from the mouth, the air gets mixed up with outside air and thus becomes cooler.
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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.
- Blowhard from your mouth onto your hands. How did you find the air from your mouth as compared to the air around you? Was it hotter, or cooler?
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?
If you were to cool these three hot things – dal, roti, rice – in which ways would you do so?
Have you seen people playing different musical instruments like flute, dholak, been ...., guitar, mridang, etc. Can you recognize their sounds with your eyes closed? Find out more about these musical instruments. Collect their pictures too.
Can you name some things which produce melodious or pleasing sounds when we blow into them?
Have you seen someone blowing on their spectacles to wipe them clean? How does the air from the mouth help in cleaning the spectacles?
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?
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?
