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Units of Action

Description

 • Action has the dimension length squared mass per time. The SI composite unit of action is the kilogram meter squared per second.
 • Maple knows the units of action listed in the following table.

 Name Symbols Context Alternate Spellings Prefixes planck standard * plancks h_bar @ Atomic

 An asterisk ( * ) indicates the default context, an at sign (@) indicates an abbreviation, and under the prefixes column, SI indicates that the unit takes all SI prefixes, IEC indicates that the unit takes IEC prefixes, and SI+ and SI- indicate that the unit takes only positive and negative SI prefixes, respectively.  Refer to a unit in the Units package by indexing the name or symbol with the context, for example, planck[standard]; by using an abbreviation, for example, h_bar; or, if the context is indicated as the default, by using only the unit name or symbol, for example, planck.
 The units of action are defined as follows.
 A standard planck is defined as a joule second.
 An atomic planck is defined as $\frac{h}{2\mathrm{\pi }}$ standard planck where h is the Planck constant.

Examples

 > $\mathrm{convert}\left('\mathrm{planck}','\mathrm{dimensions}','\mathrm{base}'=\mathrm{true}\right)$
 $\frac{{{\mathrm{length}}}^{{2}}{}{\mathrm{mass}}}{{\mathrm{time}}}$ (1)
 > $\mathrm{convert}\left(1,'\mathrm{units}',\frac{{'m'}^{2}'g'}{'s'},'\mathrm{planck}'\right)$
 $\frac{{1}}{{1000}}$ (2)
 > $\mathrm{convert}\left(1,'\mathrm{units}',\frac{{'m'}^{2}'g'}{'s'},'\mathrm{planck}\left[\mathrm{Atomic}\right]'\right)$
 ${9.482521724}{×}{{10}}^{{30}}$ (3)