Question

Why mercury is used in thermometer?
It doesn’t stick to the walls of glass
It expends uniformly when heated
It is good conductor of heat
All the above

Answer 1

Explanation:

All the above

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.