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Difference between latent heat of fusion and latent heat of vaporization of water

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Latent Heat of Fusion

Heat energy required to change unit mass of a substance from solid to liquid state  at its melting point without change in its temperature is called its latent heat of fusion.

When a substance is changed from solid to liquid state by adding heat, the process is called melting or fusion. The temperature at which a solid starts melting is called its fusion point or melting point.When a process is reversed i.e., when a liquid is cooled, it changes into solid state. The temperature at which a substance changes from liquid to solid state is called its freezing point. Different substances have different melting points. However, the freezing point of a substance is the same as its melting point.

It is denoted by Hf.

Hf = ΔQf/ m

or   Δ Qf  = m Hf … …. … … (4)

Latent heat of fusion of ice

Ice changes at 0° C into water. Latent heat of fusion of ice  is 3.36 × 105 J kg -1. That is; 3.36 × 105 Joule heat is required to melt 1 kg of ice into water at 0°C.

Latent heat of fusion of water

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