Irreversibilities might not be introduced in a process by which of the following?
A) Heat transfer across a finite temperature difference
B) Expansion
C) Friction
D) The mixing of two fluids
B) Expansion
An uncontrolled expansion is irreversible, such as a membrane bursting. An expansion of a gas in a piston-cylinder arrangement can be considered reversible if there is no friction or heat transfer from the cylinder. Mixing, friction, and heat transfer across a finite temperature difference all introduce irreversiblities.
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