Why does the temperature remain constant of a substance during it melting point or boiling point?
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The temperature remains constant because of latent heat . At the time of melting ( conversion of solid to liquid ) the heat which is applied to change its state doesn't raise its temperature because that heat gets hidden and is utilised for changing its state only , that is called latent heat of fusion.
The temperature remains constant at the time of boiling ( conversion of liquid to vapour ) the heat goes to change its state only and is known as latent heat of vaporisation
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