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Under what conditions is a system reversible or irreversible? Does it depend if it's at constant volume or pressure or no? Or (on someone's previous question) can you only tell if it's at equilibrium?
Whether a system is reversible or not is not correlated with constant volume or pressure. Rather, a system is reversible if there is constantly an equal pressure acting against the expansion. Thus, minute changes to properties in the system result in a reversal of the reaction. Generally, a reversible process is usually one near or at equilibrium.
Also, because a reversible process has minute changes to properties (i.e. volume, pressure), irreversible processes generally have larger and faster changes to these properties (for example, a gas might expand quickly, in one large increment, rather than slowly in many small ones).
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