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________ is the heat per unit mass required to change a substance from solid into liquid at the same temperature and pressure.
Question

________ is the heat per unit mass required to change a substance from solid into liquid at the same temperature and pressure.

A.

Sublimation

B.

Regelation

C.

Vaporisation

D.

Latent heat of fusion

Correct option is D


The amount of heat energy released or absorbed when a solid changing to liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.
The latent heat of fusion or melting, of a solid, is the quantity of heat in joules required to transform a solid, at its melting point, to a liquid without any variation in temperature. The latent heat of fusion of ice is 3.34 x 10⁵ joules per kilograms.

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