Question

why is murcury used in thermometer

Answer 1

Mercury is the only one in liquid state at room temperature. It's used in thermometers becoz it has high coefficient of expansion. Hence, the slightest change in temperature is notable.

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Answer 2

bcuz :-
( i ) mercury has high melting and Boiling point for making it a liquid at room temperature.

( ii ) mercury is a metal So it has a stable coefficient of expansion hence it expands uniformly and noticeably for a slight change of temperature.

( iii ) It is helpful in readings.

( iv ) It will not expand when it solidifies hence it doesn’t break the glass tube of the thermometer.