Latent Heat Definition, Example, unit, latent heat of water, Fusion
Latent Heat definition: Substance change its phases like Solid, Liquid & Gases. In this process when a substance or body melts or evaporates, some heat is released or absorbed in the form of thermal energy during constant temperature is called Latent Heat.
Latent Heat formula:
The formula of latent heat is given by,
Q = mL or L=Q/m
Where L = latent heat
Q = amount of heat
m = mass of the substance.
Simple examples of latent heat: When we boil the water and the temperature remains at 100°C until the last drop evaporates, due to the latent heat of vaporization, the added heat in the water is absorbed and carried away by releasing vapor molecules.
Latent heat of fusion of water: That is 334kJ/kg.
Latent heat of vaporization of water: That is 2264.705kJ/kg.
Let us calculate latent heat by a simple expression: Determine the latent heat of a 10kg substance if the amount of heat for a phase change is 200k.cal.
By using the formula,
Given that Mass (M) = 10 kg, Amount of heat (Q) = 200k.cal.
Latent heat = Q/M = 200/10 = 20k.cal. kg-1
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