Question

29. Define:
(a) Latent heat of fusion
(b) Latent heat of vaporization
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Answer 1

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(a)

The latent heat which is used to melt ice into water and is used breakdown the attraction of particles in the solid ice to form liquid is called the latent heat of fusion .

(b)

The heat which is used to break down the attraction of the particles of water so that it vaporizes is called the latent heat of vaporization .

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Answer 2

Latent heat of fusion:-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. Ex: The latent heat of fusion of water is 79.72 cal/gram (or) 334.0 kJ/Kg.

Define latent heat of Vaporization? Ans: The amount heat required to convert unit mass of liquid into its vapour state without change in its temperature called is latent heat of vaporization. The latent heat of vaporization of water is 540 cal/g/°C