Question

When a solid melts, its temperature remains the same, so where does the heat energy go?

Answer 1

$\bf\large\underline\pink{Answer:-}$

When a solid melts, its temperature remains the same because the heat energy supplied is utilised to break the bonds between the particles of matter. Therefore, the temperature of the solid does not change till all the solid melts.

Answer 2

The heat energy is used to overcome the force of attraction of solids so that they can melt.This is called latent heat of fusion.

At this stage, no temperature fluctuations are seen.