Usually heat.
The phase change of water (liquid) to ice (solid) is called solidification.
A phase change is not a chemical change since the chemical remains the same; water is still water, whether it is in the solid, liquid, or gas phase.
Frost is a phase change of a gas to a solid (deposition). Water vapor turns directly to ice.
gas
This phase change is called evaporation.
Vaporization (evaporation) of water to a gas is caused by heating the water.
HEAT
The phase change is called deposition: water vapor changes directly to ice.
change in temperature
When ice melts and becomes water, that is a phase change. Same when water boils and becomes steam (a gas) that is also a phase change.
The moon spins
Usually heat.
The phase change of water (liquid) to ice (solid) is called solidification.
condensation
The presence of the water in its vapor phase causes the melting point to decrease and the rock to melt and absorb the vapor.
The Phase Change is complete, e.g water melting from ice phase to liquid phase or water evaporating from liquid to gas. Save