Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.
MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping

5. When you blow on the back of your hand with your mouth wide open yourbreath feels warm about if you partially close your mouth form an ``O`` andthen blow on your hand breath fells cool. Why?

5. When you blow on the back of your hand with your mouth wide open yourbreath feels warm about if you partially close your mouth form an ``O`` andthen blow on your hand breath fells cool. Why?

Grade:11

1 Answers

Arun
25763 Points
3 years ago
We can easily explain the   phenomenon if we apply the principles of thermodynamics.

We know that when a gas expands it cools down from thermodynamics. So when you blow air from the mouth it has a higher pressure due to the force of blowing from your lungs. Now the temperature of the air in your lungs is same as that of your body temperature. Therefore, when the air just comes out of the lips it is still hot and compressed. But when it travels a distance from your lips, the gas expands and thus its temperature falls according to the laws of thermodynamics. So you feel a cold blow at a distance. 

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free