Latent heat Did You Mean Latent?

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Latent heat describes the amount of energy in the form of heat that is required for a material to undergo a change of phase (also known as "change of state"). Two latent heats are typically described. One is the latent heat of fusion (melting), and the other is the latent heat of vaporization (evaporation).

They are so named as to describe the direction of heat flow from one phase to the next:

solid → liquid → gas.

The energy change is endothermic when going from solid to liquid to gas, but exothermic when going in the opposite direction.

**Latent heats and change of phase temps of common fluids and gases**
Substance	Latent Heat Melting J/g	Melting Temp °C	Latent Heat Boiling J/g	Boiling Temp °C
Alcohol, ethyl	108	-114	855	78.3
Ammonia	339	-75	1369
Carbon Dioxide	184		574
Helium			21
Hydrogen	58	-259	455	-253
Nitrogen	25.7	-210	200	-196
Oxygen	13.9	-219	213	-183
Toluene			351
Turpentine			293
Water	335	0	2272	100

For example, in the atmosphere when a molecule of water evaporates off the surface of any body of water, heat is transported by the water molecule into a lower temperature air parcel that contains more water vapor than its surroundings. Because energy is needed to turn water into water vapor, water vapor is a way for a body to release energy. If the water vapor is returned to a liquid or solid phase (by condensation or sublimation), the stored energy is released as sensible heat onto the surface where condensation (or sublimation) has occurred.

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Latent Heat of Melting for some common Materials

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