Question

The apparatus which cools the gas is called a ______. This changes a gas into a liquid.

Answer 1

Answer:

Condenser

Explanation:

A condenser is laboratory apparatus used to condense vapors — that is, turn them into liquids — by cooling them down. Condensers are routinely used in laboratory operations such as distillation, reflux, and extraction(Wikipedia).

Condensers of of practical importance especially in synthetic organic chemistry and in separation science where vapours are often condensed and collected the substance is collected in pure form by distillation.