For a substance why does the temperature remain constant during the change of state ?
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The temperature of any substance remain constant during the change of state because the heat energy supplied is used up in changing the state of matter and also this heat is used for breaking of several bonds or attractive forces.This heat, which does not raise the temperature of the body, is called Laten heat
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Once the change of state of a substance starts the energy now supplied is being used up as latent heat. It means that it does not increase the kinetic energy of the particles and is used up only to overcome the inner particles forces of attractions. The temperature remains constant
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