Which principle best explains how this thermometer works?
(1) A liquid changes to a gas when heated.
(2) A gas changes to a liquid when heated.
(3) A liquid expands when heated and contracts when cooled.
(4) A liquid contracts when heated and expands when cooled.

The thermometer works on the principle of "zero'th law of Thermodynamics". This law states that if two bodies are in thermal equilibrium with another body, then they must also be in thermal equilibrium with each other

Explanation:

i belive its (3)

its weight is greatest on earth

yes, water is wet, just as it makes other things wet, it is wet itself, kinda like ice, when ice is in water, the ice makes water cold, and ice is cold, therefore with that example, water is wet