Simplifying to different units

Question

Is there a way to force Mathematica to UnitSimplify to a different unit? For example, I would like kg m^2/s^2 to simplify to N m but it always simplifies to J. Is there a way to specify a units preference?

Related: Implementing CGS unit system in Mathematica 9. Of course N m/J are the trickiest as one would often want to use both in the same calculation. — Szabolcs, Dec 03 '12 at 19:28
See notebook here for some ideas on how to do various conversions. For your example, the GroebnerBasis approach using Meters and Newtons as "lowest" variables can be adapted to do what you want. — Daniel Lichtblau, Dec 03 '12 at 19:45

score 5 · Accepted Answer · answered Dec 03 '12 at 19:28

5

I would use UnitConvert:

UnitConvert[Quantity[1, 
     ("Kilograms"*"Meters"^2)/
       "Seconds"^2], 
   Quantity["Newton Meters"]]

answered Dec 03 '12 at 19:28

Rolf Mertig

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Simplifying to different units

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