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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?
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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?
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?
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.
Put your finger under your nose. Can you feel any air when you breathe out from your nose?
Jump 30 times. Did you feel breathless?
What was the difference in your count before and after jumping?
We blow to cool hot things as well as to warm them. Give examples of each.
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?
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?
