1. （使）液化
When a gas or solid substance liquefies or is liquefied, it changes its form and becomes liquid.

1. become liquid or fluid when heated

e.g. the frozen fat liquefied

Synonym: fluxliquify

2. make (a solid substance) liquid, as by heating

e.g. liquefy the silver

Synonym: liquifyliquidizeliquidise

3. become liquid

e.g. The garden air overnight liquefied into a morning dew