Question

why we use mercury in clinical thermometer​

Answer 1

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Mercury is the only metal that is in liquid state at room temperature. It's used in thermometers because it has a high coefficient of expansion.The mercury expands and contracts with the changes in the temperature.

Answer 2

we use mercury in thermometer due to the following reasons..

• it does not fall immediately after checking a person's body temperature.
• it can remain in its liquid state for long time and in upto high temperature
• it do not stick to wall of the tube.
• it is a clear shining liquid