-:The Latent heat of fusion:-
The latent heat of fusion of a substance is the quantity of heat required to convert one unit mass (1kg or 1g) of the substance from solid state to the liquid state at its melting point without any change of temperature.
The latent heat of ice may be defined as follows:
The quantity of heat required to convert one unit mass of ice into liquid water at 0°C (under normal pressure) is called the latent heat of fusion of ice.
The value of the latent heat of fusion of ice in SI unit is 3.35 x 105 J/kg.
Thus, to melt 1 kg of ice at 0°C into water at
the same temperature (0°C) 3.35 x 105 Joules of heat energy is required.
Therefore, ice at 0°C is more
effective in cooling than the same quantity of water at the same temperature (0°C).
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