Question

Latent heat of fusion and latent heat of vaporisation

Answer 1

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Latent Heat Of Fusion:

The energy required to change the phase of a substance is known as a latent heat. The word latent means hidden.

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.

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Latent Heat Of Vaporisation:

The "amount of heat" needed to convert "unit mass of liquid" into its "vapour state" without change in its temperature is known as "latent heat of vaporization".

Example: The "latent heat of vaporization" of water is "540 cal/g/°C".

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