Advertisements
Advertisements
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?
उत्तर
On blowing hard from the mouth onto the hands, the air from the mouth feels hotter as compared to the air around.
APPEARS IN
संबंधित 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?
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?
If you were to cool these three hot things – dal, roti, rice – in which ways would you do so?
For what other things do you blow air from your mouth?
Put your hand on your chest. When you breathe in, does your chest come out or go in.
Now again count how many times in one minute you breathed in and out.
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?
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.
