Answer to Question #222149 in General Chemistry for Sajeel Ahmed

Question

Discuss the entropy of free compression process.How does temperature remain constant during a phase transition . Explain with the example of suitable system.

Answer 1

In particular during free expansion of a gas, which is a complicated irreversible process involving turbulence and gas nonuniformities of pressure and temperature (to the extend that these quantities can be defined at all for such a marked nonequilibrium situation) entropy increases.

During a change of the state of matter, the supplied energy is not used to increase the kinetic energy of the molecules, but to change the binding energies. Therefore, the temperature remains constant.