The specific latent heat of vaporization of a substance is the quantity of heat needed to change unit mass from
liquid to vapour with a change of temperature
liquid to vapour without a change of temperature
vapour to liquid without a change of temperature
vapour to liquid with a change of temperature
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This question was previously asked in
UPSC NDA-1 – 2022
Latent heat is the heat energy absorbed or released during a phase transition (like melting, freezing, vaporization, condensation) at a constant temperature and pressure. Specific latent heat refers to the amount of heat per unit mass. Vaporization specifically refers to the transition from liquid to gas. This phase change occurs without a change in temperature, as the energy is used to break intermolecular bonds.