The amount of energy required to change any state of matter is called latent heat. The latent heat used in the transformation from a liquid state to a solid state is called the latent heat of fusion. While the change from the liquid state to the gas state is called latent heat vaporization. The latent heat of fusion for water is 334 kJ/kg and the latent heat of vaporization is 2.265 kJ/kg.
The change of state from ice to water
and water to steam necessarily requires energy, but if the steam is converted
to water by freezing, 2265 kJ will be produced for each kilogram of steam
frozen. For this reason, steam burns are very dangerous. At least all that
energy is transferred to your skin. If water is frozen, 334 kilojoules of
energy will be released from each kilogram of frozen water.
This amount of energy in the freezer
must be released in some form.
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