Either freezing or crystallization.
The name for solid water is ice. It changes to a liquid when it melts.
Sublimation is the process in which solid directly changes into gaseous state. In the case of changing gas into solid, the process is known as deposition.
When a liquid changes to a solid the process is known as solidification or, more commonly, freezing.
The name of the process is 'Melting'. It is that because the solid is melting into a liquid.
ice, it melts
Freeze
Melting...
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The physical change of a solid to a liquid at the melting point called melting.
The name of the process in which a solid changes directly into a gas is called sublimation.
The name of the process in which a solid changes directly into a gas is called sublimation.
Freezing Point