Chemical Engineering Thermodynamics
When a gas is expanded from high pressure region to low pressure region ; temper -ature change occurs. This phenomenon is related to the

Gibbs-Helmholtz equation
Gibbs-Duhem equation
Joule-Thomson effect
Third law of thermodynamics

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

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

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