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

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

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Chemical Engineering Thermodynamics
Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg . K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is

Saturated vapour
Partially condensed vapour with quality of 0.1
Partially condensed vapour with quality of 0.9
Superheated vapour

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