Why does the temperature of a substance remain constant during its melting or boiling point Class 9

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• Answer:

    The temperature of a substance remains constant during melting and boiling points till the completion of melting and boiling. It is because substance makes use of latent heat of fusion to overcome force of attraction between particles of solid to change into liquid during melting and latent heat of vaporization to overcome force of attraction between particles of liquid to change into vapours during boiling. Therefore, temperature remains constant.
  

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Text Solution

Solution : The temperature of a substance remains constant during melting and boiling points till the completion of melting and boiling. It is because substance makes use of latent heat of fusion to overcome force of attraction between particles of solid to change into liquid during melting and latent heat of vaporisation to overcome force of attraction between particles of liquid to change into vapours during boiling. <br> Therefore, temperature remains constant.

Why does the temperature of a substance remains constant during melting and boiling even when heat is being supplied to it continuously.

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