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प्रश्न
Take a glass. Bring it near your mouth and blow hard on it. Do this two or three times. Does the glass look hazy?
उत्तर
Yes, a mirror can also be made hazy in the same way. On blowing air from the mouth on the mirror, the mirror becomes moist. The air blown from the mouth is hot and the mirror is cold. The hot air that we breathe out contains water vapours which turn into tiny droplets of water when it comes in contact with the colder mirror. This makes the mirror moist and hazy. The air blown from the mouth is wet.
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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?
Can you think of any other way in which you use the warmth from your breath?
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?
For what other things do you blow air from your mouth?
Make whistles of the things given below. Write in a sequence–from the loudest to the softest whistle.
– Wrapper of a toffee
– A leaf
– A balloon
– The cap of a pen
– Any other thing
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 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.
While playing, Amit hit a wall. His forehead was swollen. Didi immediately folded a scarf (4-5 times), blew on it, and kept it on Amit's forehead. Why do you think didi did this?
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?
