The amount of heat required to change a liquid to gaseous state withou

The amount of heat required to change a liquid to gaseous state without any change in temperature is known as

specific heat capacity

mechanical equivalent of heat

latent heat of vaporization

quenching

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This question was previously asked in

UPSC NDA-1 – 2017

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The heat energy required to change the state of a substance from liquid to gas at a constant temperature (its boiling point) is called the latent heat of vaporization. This energy is used to overcome the intermolecular forces holding the substance in the liquid state during the phase change, rather than increasing the kinetic energy of molecules, which would increase temperature.

Latent heat is the heat absorbed or released during a phase transition (like melting, freezing, vaporization, condensation, sublimation) that occurs at a constant temperature. ‘Latent’ means hidden, as the heat transfer does not result in a temperature change during the process.

Specific heat capacity relates heat added to temperature change. Mechanical equivalent of heat relates work and heat. Quenching is a rapid cooling process.

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