9th Class Science Matter in Our Surroundings Question Bank 9th CBSE Science Matter in Our Surroundings

  • question_answer
                      Why does the temperature of a substance remain constant during it melting point or boiling point?                            [NCERT Exemplar]

    Answer:

                   The temperature of a substance remains constant at its melting and boiling  points until all the substance melts or boils because, the heat supplied is continuously used up in changing the state of the substance by overcoming the forces of attraction between the particles. This heat energy absorbad without showing any rise in temperature is given the name latent heat of fusion/latent heat of vaporisation.


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