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1.4 LATENT HEAT

The amount of heat energy required to change the phase of matter for a substance without
changing the temperature is called latent heat. The heat energy supplied to a substance during

change of phase does not cause a change in the temperature of the substance. When a solid melt,
heat is absorbed but the temperature remains constant. When a liquid is boiling, heat is also

absorbed but the temperature remains constant. The heat absorbed or given out at constant
temperature during change of phase is known as latent heat. The four main changes of phase:

melting, boiling, condensation and solidification are summarized in Figure 6.8.

Figure 1.8

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