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Get numbers out of PhysicalConstants?


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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