Suppose you are given the choice in winter of using one thick blanket or two thin blankets joined together. What would you choose and why?

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Solution

I would choose two thin blankets joined together because the air trapped between them being a bad conductor of heat would not allow the body heat to go outside.

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(a) If you have to choose between two thin blankets and a thick blanket on a cold winter night, which one will you choose?

(b) Stainless steel pans are usually provided with copper bottoms. Why?

(c) You may have noticed that a few sharp jerks are given to a clinical thermometer before using it. Why is it done so?
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