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Question

Mercury is used in thermometers to measure the temperature because:


A
It is the only metal that is liquid at room temperature.
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B

It expands or contracts with temperature.

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C

It changes state with change in temperature.

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D
Mercury does not stick to glass walls.
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Solution

The correct options are
A It is the only metal that is liquid at room temperature.
B

It expands or contracts with temperature.


D Mercury does not stick to glass walls.
Mercury is a good conductor of heat and remains liquid at room temperature and can flow. So, as the temperature of mercury increases, there is a expansion in the length of mercury column. Also, it is easily visible and does not stick on the walls of test-tube. So, multiple readings can be taken in a short interval of time.

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