Question

Q1. ans in your own word
1. Why do we wear woolen clothes in winter?
Ans _________________
2. Why is mercury or alcohol used in a thermometer?
Ans ________________
3. What is meant by thermovare?
Ans ________________.
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Answer 1

Answer:

1.Woolen clothes contains a large amount of trapped air. Since air is a bad conductor of heat it does not allow the body heat to flow out, as a result of which, we feel warm and comfortable.

2.There is a technical reason for using mercury in clinical thermometers. Mercury has a greater coefficient of thermal expansion than alcohol. This means a column of mercury will expand and rise more than a column of alcohol for the same temperature change. As a result, you can get finer readings with mercury.

3.Thermoware is something that does not allows the heat to escape and keeps warm. eg. sweater, air tight containers.

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