Question

Why do we use mercury as a fluid in thermometer and not water?
Why do we wear woollen clothes in winter?

Answer 1

Answer:

1) mercury as a fluid in thermometer and not water because mercury does not stick to glass lining of thermometer and also it does not have any great impact of temperature

Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. ... The melting point of water is 0oc but when you see mercury freezing point (melting point) -38.83oc and the boiling point of the mercury is 356.73oc. The boiling point of water is 100oc

2) We wear woollen clothes in winter because air is a poor conductor of heat and woollen clothes do not allow the transfer of body heat to the environment and keep us warm. Woolen yarn has large amount of air trapped between its crimps.

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Explanation: