Question

Why does the temperature of a substance remained constant during melting point or boiling point

Answer 1

Answer:

The 'temperature of a substance' remains constant during its melting and boiling point because the change in any state of matter as n solid to liquid or the liquid to a gas involves crossing the 'latent heat of fusion' which causes a change in the intermolecular spacing of the molecules in the substance.

DON'T FORGET TO MARK ME AS BEST ANSWERS AND THANKS ME......

Answer 2

Answer:

Because when we supply heat to the subtance at its boiling or melting point, that heat is used up to break the intermolecular bonds of the subtance hence the temperature doesnt not rise up due to the heat at its melting or boiling point.