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.