What happens to the heat supplied to the substance when, the heat supplied causes no change in the temperature of the substance?

Explanation

When heat is supplied to a substance and there is no change in its temperature, it indicates that the substance is undergoing a phase change. This can occur in two primary scenarios:

1. **Solid to Liquid (Melting)**: When a solid, such as ice, is heated at its melting point (0°C for ice), it absorbs heat without an increase in temperature. This heat is referred to as latent heat of fusion. The energy supplied is used to break the bonds between the molecules in the solid state, allowing them to transition into the liquid state. Thus, the ice melts into water while the temperature remains constant at 0°C.

2. **Liquid to Vapor (Vaporization)**: Similarly, when water reaches its boiling point (100°C), it can absorb heat without a change in temperature until it completely transforms into vapor. This heat is known as latent heat of vaporization. During this phase change, the energy supplied is used to overcome the intermolecular forces in the liquid, allowing the molecules to escape into the gaseous state.

In summary, when heat is supplied to a substance without a change in temperature, the energy is utilized for phase changes rather than increasing the kinetic energy of the molecules, which would raise the temperature.

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