The specific latent heat of vaporization of a substance is the quantit

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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
This question was previously asked in
UPSC NDA-1 – 2022
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The specific latent heat of vaporization is defined as the heat energy required to change the state of a unit mass of a substance from liquid to vapour at a constant temperature.
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.
There are two main types of specific latent heat: specific latent heat of fusion (solid to liquid or liquid to solid) and specific latent heat of vaporization (liquid to gas or gas to liquid). Each substance has characteristic values for these latent heats.

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