QUASISTATIC PROCESS
In thermodynamics a quasistatic process is a thermodynamic process , that happens infinitely slowly .
No real process is quasistatic but some processes can be approximated by performing them very properly.
Any reversible process is a necessirily a quasistatic one , However some Quasistatic process are irreversible . If there is a heat flowing (in or out of the system) or entropy is being created in such a way . An example of a Quasistatic process that is not reversible is a compression against the system with a piston subjected to friction -- although the system is always in thermal equilibrium .
The notable example of a process that is not even Quasistatic is the slow heat exchange between two bodies at two different finitely temperature where the heat exchange is controlled by adiabatic process.
The states of the two bodies are never infinite close to equilibrium . since thermal equilibrium requires that the two bodies at the same temperature.
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