Class 5
Environmental Studies
Chapter 15
Blow Hot, Blow Cold
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Textual Exercise
Page No 141
Question Do This:
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.
- Have you warmed your hands in winter by blowing on them when they are cold? How does it feel?
- Blow hard from your mouth onto your hands. How did you find the air from your mouth as compared to the air around? Was it hotter, or cooler?
- Now put your hands at some distance from your mouth, and blow again. Does the air from your mouth feel warm? Why?
Answer:
Disclaimer: This section comprises questions that has to be answered by a student based upon his own imagination. Considering this, the answer to the same has not been provided.
Page No 142:
Question Think and Tell:
- Can you think of any other way in which you use the warmth from your breath?
- 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?
- 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?
- If you were to cool these three hot things – dal, roti, rice – in which ways would you do so?
- Mini tried to cool her tea by blowing on it. Which do you think will be hotter – Mini’s tea or the air she blew from her mouth?
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