Joule-second: Difference between revisions
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{{Unreferenced|date=December 2009}} |
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{{Dablink|For information about the unit "joule/second" see [[watt]]}} |
{{Dablink|For information about the unit "joule/second" see [[watt]]}} |
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The '''joule-second''' ('''J s''' or ''' |
The '''joule-second''' ('''J s''' or '''J·s''') is a unit equal to a [[joule]] multiplied by a [[second]], used to measure [[action (physics)|action]] or [[angular momentum]]. The joule-second is the unit used for [[Planck's constant]]. |
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In [[SI]] base units, the joule-second is <math>\frac{kg \cdot m^{2}}{s}</math>. |
In [[SI]] base units, the joule-second is <math>\frac{kg \cdot m^{2}}{s}</math>. |
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Revision as of 03:29, 29 August 2012
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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 or angular momentum. The joule-second is the unit used for Planck's constant.
In SI base units, the joule-second is .
Action
The action of a system has the dimensions of energy integrated over time; it is therefore measured in joule-seconds.
Angular momentum
The angular momentum of an object is the integral with respect to time of the torque on the object. Torque in the SI system has the unit N·m, so angular momentum has the unit N·m·s, or J·s.