Question

(1)What happens to heat energy which is supplied to solid when it starts melting
(2)at what temp. in kelvin scale does water boil
(3)what happens when we supply heat energy to water it changes its state what is this heat energy called?

Answer 1

1) When the temperature reaches the melting point, the solid, absorbs energy and increases its internal energy. ... At the same temperature, the solid absorbs anenergy called the latent heat of fusion to change its state to liquid. After the solid melts, its temperature increases further if more heat is supplied.

2)Water boils at 373.16K ( Kelvin scale)

3)When water is heated, its temperature does not change until it has changed into the vapour state completely. This is because the heat which is supplied is used in changing the state by overcoming the forces of attraction between the constituent particles. Thus, the heat is absorbed without showing any rise in temperature and is known as latent heat.