Question

why is water not used instead of mercury in thermometers. Pls tell in a simple language​

Answer 1

Answer:

It is used in thermometer because it has high coefficient of expansion. Hence the slightest change in temperature is notable when it is used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperature. So instead of water mercury is used in thermometer.

Explanation:

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Answer 2

Mercury expands on heating..so when we have fever or hot temperature , Mercury rises up the thermometer tube..

we can then measure temperature by the calibrations ( markings like in a school scale)..

but when it comes to water , water does not have the property to expand like Mercury..if some amount of water evaporates then we will get wrong readings..