Definition: The term "backjoint" in physics refers to a physical property or mechanism that is associated with the reverse process of an irreversible process. In other words, it describes a phenomenon where one system undergoes a change or transformation into another system without any direct output from the original system. For example, consider a chemical reaction in which reactants are converted into products through a series of steps. When the temperature and pressure are adjusted to a point at which the reaction is no longer reversible (i.e.,
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