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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.

For example, in the Atmosphere when a molecule of water evaporates from 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 Deposition ), the stored energy is released as Sensible Heat onto the surface where condensation (or sublimation) has occurred.


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