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1 When the burner of a stovetop is very hot, it is a source of heat energy. 2  Anything placed onto the stovetop and warmed, whether a pot of tea or a skillet for frying eggs, also become sources of heat energy. 3  Automobile fuels such as gasoline are sources of heat energy, as is the hot engine of a racecar or a school bus.
The latent heat of condensation, absorbed when the water evaporated, is released to the atmosphere when the water vapor condenses back into cloud water (or cloud ice). This source of heat helps drive clouds and most other weather systems. For instance, evaporation from the ocean surface is the primary source of energy for hurricanes. Heat is the main cause of evaporation.