Question

why temperature of a substance remain constant during its melting point or boiling point​

Answer 1

Answer:

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.

Answer 2

Answer:

temperature remains constant during its melting or boiling point because the heat energy given for the substance is utilised for changing its state therefore there is no change in its melting or boiling point

hope its helpful......