Question

why does the temprature remains unchainged until the entire solid changes into liquid even if we are heating

Answer 1

As a solid is heated, its temperature increases as the molecules move faster. During the phase change, when solid melts into liquid, its temperature remains constant as the heat energy is stored as potential energy.

hope helped

Answer 2

Because the heat is used to overcome the force of attraction b/w the particles of a given substance . If it is a solid then its temp. Will change only when it will completely changed into liquid