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MathGroup Archive 2004

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Re: Physical Constants package

  • To: mathgroup at
  • Subject: [mg46954] Re: Physical Constants package
  • From: "Curt Fischer" <crf3 at>
  • Date: Wed, 17 Mar 2004 02:29:07 -0500 (EST)
  • References: <> <c3880v$bjq$>
  • Sender: owner-wri-mathgroup 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 such
0.39789711297139907/(Meter^3*(Kilogram/(Joule*Second^2))^(3/2))?  Plain
inspection shows that the units all cancel out, but the Miscellaneous`Units`
package doesn't do the job.  In general, the problem seems to be with units
to some non-integer power.

Curt Fischer

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