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The joule-second (J s or J·s) is a unit equal to a joule multiplied by a second, used to measure action. The action of a system has the dimensions of energy integrated over time; it is therefore measured in joule-seconds. The joule-second is the unit used for Planck's constant. It is also the unit for the angular momentum of a rotating object.

In SI base units, the joule-second is ${\displaystyle {\frac {kg\cdot m^{2}}{s}}=J\cdot s.}$