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MathGroup Archive 2004

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Re: Physical Constants package

  • To: mathgroup at
  • Subject: [mg46978] Re: Physical Constants package
  • From: "John Jowett" <John.Jowett at>
  • Date: Thu, 18 Mar 2004 01:25:05 -0500 (EST)
  • Organization: CERN
  • References: <> <c3880v$bjq$> <c38v35$g4m$>
  • Sender: owner-wri-mathgroup at

You need to apply PowerExpand to the expression.

If you do this sort of thing a lot, you might be interested in our enhanced
version of the standard packages for constants and units.  You can download
it from

Then your example would be

which returns


John Jowett

"Curt Fischer" <crf3 at> wrote in message
news:c38v35$g4m$1 at
> Ed Pegg Jr wrote:
> > A package that deals with physical constants has recently been
> > added to the Mathsource Infocenter library.
> >
> >
> >
> > For A to C, the constants included are as follows:
> >
> > accelerationOfGravity, ageOfUniverse, ageOfUniverseInGYear,
> > astronomicalUnit, atomicMassConstant, avogadroConstant,
> > baryonDensityOfUniverse, bohrMagneton, bohrMagnetonIneV,
> > bohrRadius, boltzmannConstant, classicalElectronRadius,
> > comptonWavelength, comptonWavelengthReduced,
> > conductanceQuantum, constantOfGravitation, conversionConstant,
> > conversionConstantSquare, cosmicBackgroundTemperature.
> On a sort-of related note, does anyone know when quantum chemistry units
> (energy in Hartrees, distance is Bohrs, etc) will find there way into the
> Miscellaneous`Units` package?
> Also, is there any good way to get Mathematica to simplify expressions
> as
> 0.39789711297139907/(Meter^3*(Kilogram/(Joule*Second^2))^(3/2))?  Plain
> inspection shows that the units all cancel out, but the
> package doesn't do the job.  In general, the problem seems to be with
> to some non-integer power.
> -- 
> Curt Fischer

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