-as of [21 SEPTEMBER 2024]–
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*abbreviated ‘J⋅s’ or ‘J s’*
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*the ‘joule-second‘ is the product of…*
*THE JOULE*
(an ‘SI-derived unit’)
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*THE SECOND*
(an ‘SI base unit’)
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*the ‘unit’ used to calculate ‘planck’s constant’*
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*the ‘joule-second’ is a ‘unit’ of ‘action’ (or ‘angular momentum’)*
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The joule-second also appears in quantum mechanics within the definition of Planck’s constant
Angular momentum is the product of an object’s moment of inertia,
in units of kg⋅m2
and its angular velocity in units of rad⋅s−1.
This product of moment of inertia and angular velocity yields kg⋅m2⋅s−1 or the joule-second.
Planck’s constant represents the energy of a wave, in units of joule, divided by the frequency of that wave, in units of s−1.
This quotient of energy and frequency also yields the joule-second (J⋅s)
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Base units
In SI base units the joule-second becomes kilogram-meter squared-per second or kg⋅m2⋅s−1.
Dimensional Analysis of the joule-second yields M L2 T−1.
Note the denominator of seconds (s) in the base units
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Confusion with joules per second
The joule-second should not be confused with the physical process of joules per second (J/s).
Joules per second:
In physical processes, when the unit of time appears in the denominator of a ratio, the described process occurs at a rate.
For example, in discussions about speed, an object like a car travels a known distance of kilometers spread over a known number of seconds, and the car’s rate of speed becomes kilometers per second (km/s).
In physics, work per time describes a system’s power;
defined by the unit watt (W),
which is joule per second (J/s)
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joules-second:
To understand joules x second (J⋅s) we can imagine the operator of an energy storage facility quoting a price for storing energy.
Storing 10,000 joules for 400 seconds would cost a certain amount.
Storing double the energy for half the time would use the same resources, and cost the same
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See also
Orders of magnitude (angular momentum)
Action (physics)
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References[edit]
^ BIPM. Le Système international d’unités / The International System of Units (‘The SI Brochure’). Bureau international des poids et mesures, eighth edition, 2006, updated 2014. URL http://www.bipm.org/en/si/si_brochure/, ISBN 92-822-2213-6.
^ Schlamminger, S.; Haddad, D.; Seifert, F.; Chao, L. S.; Newell, D. B.; Liu, R.; Steiner, R. L.; Pratt, J. R. (2014). “Determination of the Planck constant using a watt balance with a superconducting magnet system at the National Institute of Standards and Technology.” Metrologia. 51 (2): S15. arXiv:1401.8160 . Bibcode:2014Metro..51S..15S. doi:10.1088/0026-1394/51/2/S15. ISSN 0026-1394.
en.wikipedia.org /wiki/Joule-second
Joule-second
Contributors to Wikimedia projects3-3 minutes 12/27/2005
(Redirected from Joule second)
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