Reversible process
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A reversible process is a process that can be reversed through tiny changes, without a dissipation of energy. This is a useful concept in thermodynamics.
Alternatively, a reversible process is one that can be reversed without changing the system or its surroundings.
An example of an irreversible process is the puncturing of a car tire. It is impossible to put the air back in the tire and patch it up without dissipating energy or changing the tire and the surroundings.