Q:

What is it called when a liquid changes to a solid?

A:

The phase change of a liquid to a solid is referred to as either solidification or freezing. When the temperature of a substance is lowered below the substance's freezing point, the substance goes through a phase change from a liquid to a solid.

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The terms solidification and freezing are used interchangeably. This process occurs when heat is taken away from a liquid substance past its freezing point. The substance then crystallizes and forms stronger bonds between molecules, giving it a rigid structure.

Every known liquid freezes into a solid when enough heat is taken away except for liquid helium, which stays liquid even when the temperature is absolute zero. The opposite of freezing or solidification is called melting.

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