Question

why is mercury used in thermometer​

Answer 1

Answer:

In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on a tube.With changes in temperature, the mercury expands and contracts, and the temperature can be read from scale. Mercury thermometer is used to determine body, liquid and vapour temperature

Answer 2

Answer:

Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures.