Question

Define: Latent heat of vaporisation

Answer 1

1. Latent heat of vaporisation: It is the amount of heat required for the transformation of a liquid at its boiling point to gas at a constant temperature. The latent heat of vaporization differs for various liquids.
2. The heat of vaporization is characterized as the amount of energy (heat) required to convert $1g$ a liquid into a gas without any change in the temperature of the liquid itself.
3. In the case of water, the latent heat to transform it into vapor is the energy of boiling water at which it changes without temperature change. This latent heat amounts to $22.5\times {10}^{5}J/kg.$
4. Therefore latent heat of vaporization measures the heat given to a liquid to change its state into its gaseous state.