Because a current of cold air from a window or a door, blows upon them.
Does quicksilver expand when heated?
Like other metals, quicksilver expands as it grows warmer, and contracts as it grows cooler.
Is quicksilver in the form of a solid or a fluid?
It is a fluid as we usually see it.
For what is quicksilver used?
It is used for filling the tubes of thermometers.
What is a Thermometer?
It is an instrument used for measuring the degree or quantity of heat in any substance.
How does heat affect the quicksilver?