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Message: <blockquote data-quote="Olgar Shiverstone" data-source="post: 6168515" data-attributes="member: 5868">Oh, don't get me wrong -- I'm not arguing that it isn't both easier and more efficient to use SI than alternatives, and certainly I prefer SI units where possible.  I've never had NIST or the OIML come down to some of the government programs I've worked on which used English units and insist we start measuring velocities in m/s instead of ft/s or pressures in kPa instead of lb/ft^2, though.The point is that nature doesn't recognize units; equations are dimensionless, and you can run your calculations in whatever internally consistent measurement system you choose to use, particularly since the majority of SI units are derived units from a small number of base units (including Volts, Teslas, and Newtons that you reference).  Whether you should is an exercise left to the reader.</blockquote>