Question

Which thermometric property is used for making mercury thermometer ? Why only mercury is used for making clinical thermometer?

Answer 1

Volume expansion of liquid is the property used

Because mercury expands at a certain temperature hence used in clinical thermometer.

Answer 2

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.