Mercury is used in thermometers to measure the nbsp-temperature because-It is the only metal that is liquid at room temperature-It expands or contracts with temperature-It changes state with change in temperature-Mercury does not stick to glass walls-

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Clinical Thermometer and Lab Thermometer

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Question

Mercury is used in thermometers to measure the temperature because:

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

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It expands or contracts with temperature.

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It changes state with change in temperature.

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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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Q. It is said that mercury is used in defining the temperature scale because it expands uniformly with temperature. If the temperature scale is not yet defined, is it logical to say that a substance expands uniformly with temperature?

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Q) Mercury is a liquid and conducts electricity . Do you think it is an electrolyte?( Hint : Mercury is a metal that is a liquid at room temperature)

Ans) No, though mercury is a liquid at room temperature it is a metal . It cannot be an electrolyte. This is because most of the liquids that can conduct electricity or acids bases and salts whereas mercury is a metal.

Could you please check my answer.

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