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MathGroup Archive 2005

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Re: Get numbers out of PhysicalConstants?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg62584] Re: [mg62572] Get numbers out of PhysicalConstants?
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Tue, 29 Nov 2005 04:44:17 -0500 (EST)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

Needs["Miscellaneous`PhysicalConstants`"];

removeUnits=
    Thread[
      Union[
          Cases[
            ToExpression[
              Names["Miscellaneous`PhysicalConstants`*"]],
            _Symbol?(!NumericQ[#]&),Infinity]]->1];

VacuumPermeability/.removeUnits

Pi/2500000


Bob Hanlon

> 
> From: "Wonseok Shin" <wssaca at gmail.com>
To: mathgroup at smc.vnet.net
> Date: 2005/11/28 Mon AM 01:38:15 EST
> Subject: [mg62584] [mg62572] Get numbers out of PhysicalConstants?
> 
> Hello,
> 
> Is there any way to get numbers out of the constants defined in
> Miscellaneous`PhysicalConstants` package?  Carrying units all the time
> is inconvenient in calculation.
> 
> For example,
> In[1]:= << Miscellaneous`PhysicalConstants`
> In[2]:= VacuumPermeability
> Out[2]= \!\(\(p\ Second\ Volt\)\/\(2500000\ Ampere\ Meter\)\)
> 
> I want to get the number p/2500000 out of VacuumPermeability, without
> units.  How can I do this?
> 
> 


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