Question

For any substance, why does the temperature remain constant during the change of state?​

Answer 1

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During the change of state of any matter heat is supplied to the substance. The molecules of this matter use heat to overcome the force of attraction between the particles, at this period of time, temperature remains constant. This extra heat is acquired by the molecules in the form of hidden heat called latent heat to change from one state of matter to the other state.

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Answer 2

Answer:

For example, let's take the example of melting of ice. If the temperature becomes constant, it means that the heat is being used to break the bonds between molecules of ice. This is called latent heat of fusion. The amount of heat required to change 1 g of a substance at the temperature of its melting point from the solid to the liquid state without changing temperature is called its latent heat of fusion.