Amount of energy required to change the liquid to gas and vice versa without any change in temperature is termed as

The amount of energy required to change a substance from a liquid to a gas (and vice versa) without any change in temperature is termed as Latent Heat.

Here's a step-by-step explanation:

1. When a substance is heated, its particles start to move faster and its temperature rises.
2. When the substance reaches a certain temperature, known as its boiling point, the particles have enough energy to change state from liquid to gas.
3. The energy that is absorbed during this process is used to break the bonds between the particles, not to raise the temperature. This energy is known as the Latent Heat of Vaporization.
4. Conversely, when a gas changes to a liquid (condensation), this energy is released.
5. The amount of energy absorbed or released during a phase change is independent of temperature, hence the term 'latent' (hidden).