Heat.
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You can use heat to change a liquid into a gas through a process called evaporation or boiling.
When alcohol and mercury boil, they both change from a liquid to a vapor/gas.
To change a gas to a liquid, you need to lower the temperature of the gas below its boiling point while keeping the pressure constant. This process is known as condensation and it causes the gas particles to slow down and come together to form a liquid.
Heating can change matter from a solid to a liquid or from a liquid to a gas. Cooling can change matter from a gas to a liquid or from a liquid to a solid.
The phase change in which a substance changes from a gas to a liquid is called condensation. It occurs when the temperature of the gas decreases to reach its condensation point, causing the gas molecules to come together and form a liquid.
The change from gas to liquid is called condensation. During condensation, gas molecules lose energy and come closer together, forming a liquid. This typically occurs when the temperature of a gas decreases.