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11

As J.M. comments, but opts not to post as an answer, you can use Convert in the Units package to convert between types. Be sure to read the documentation on that package. Needs["Units"] Convert[(32.5 Newton)/(7 Meter/Second^2), Kilogram] 4.64286 Kilogram You will also find use in the Automatic Units package described on the Wolfram Blog.

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The units associated with physical constants do not play nicely with expressions that expect a numerical value. If you want only the numerical value of a constant, use Part. A motivating example: Needs["PhysicalConstants"]; Plot[1/Sqrt[1 - v^2/SpeedOfLight^2], {v, 0, 0.9 SpeedOfLight}] (* Plot::plln: Limiting value (2.69813*10^8 Meter)/Second in ...

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In v. 9, speed of light is a quantity. Try Quantity["SpeedOfLight"] The output will look like the following: 1 c However, its FullForm is actually Quantity[1, "SpeedOfLight"] You will find addition information about how to use physical constants as quantities in the Compatibility Tutorial and in the Units Overview.

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You can use SetPrecision to set the interpreted precision of a numeric value, or Rationalize to convert it into an exact value. Be cautious about manufacturing false precision.

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