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Action (physics)
In physics, action is an attribute of the dynamics of a physical system. It is a mathematical functional which takes the trajectory, also called path or history, of the system as its argument and has a real number as its result. Generally, the action takes different values for different paths. Action has the dimensions of [energy[time] or [momentum[length], and its SI unit is joule-second. This is the same unit as that of angular momentum.

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