Chemical Engineering Thermodynamics
If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the

Nernst Heat Theorem
Clayperon-Claussius equation
Maxwell's equation
Van Laar equation

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Chemical Engineering Thermodynamics
A large iceberg melts at the base, but not at the top, because of the reason that

Ice at the base contains impurities which lowers its melting point
All of these
Due to the high pressure at the base, its melting point reduces
The iceberg remains in a warmer condition at the base

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