Latent Heat

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The amount of heat energy absorbed or lost by a substance when changing phases is called “latent heat.” When steam is condensed towater, the temperature doesn’t change, but heat must be extracted from
the steam as it goes through a phase change to water. To change water to steam, heat must be added. When a substance changes from a solid to a liquid or from a liquid to a vapor, the heat absorbed is in the form of latent heat. This heat energy is referred to as latent heat because it cannot be sensed by measuring the temperature.

cal-2-12

The latent heat of vaporization for hydrocarbon compounds is given in Table 2-9. The latent heat of vaporization of water is given by hfg in the steam table (Table 2-6).

table-2-9

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