Action (physics)
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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], and its SI unit is joule-second. This is the same unit as that of angular momentum.
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See also
- Calculus of variations
- Functional derivative
- Functional integral
- Hamiltonian mechanics
- Lagrangian
- Lagrangian mechanics
- Measure (physics)
- Noether's theorem
- Path integral formulation
- Planck's constant
- Principle of least action
- Quantum physics
- Entropy (the least Action Principle and the Principle of Maximum Probability or Entropy could be seen as analogous)
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