Question
Tue March 05, 2013 By: Karthik

1)Why 2 thin blankets are warmer than a single blanket of double thickness? 2)what do you mean by degree of freedom of a gas ? 3)stainless steel cooking pans are preferred with extra copper bottoms? why? 4)wooden sleepers are provided below rails while laying railway lines .Why? 5)sand is thrown on tracks coversd with snow on hilly area? Why?

Expert Reply
Tue March 05, 2013
1. as air is trapped in between the layers so it will not allow heat to escape from the body.
2.degree of freedom of gases means the number of independent coordinates required to describe the motion and position of the molecules of that particular gas.
3. as heat conductivity of copper is very high.
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