On 4/04/22 3:45 pm, David Mertz, Ph.D. wrote:
An electron volt is a unit of energy. Or of mass. Or of momentum.

Well, in relativity they're all really the same thing, or
at least interconvertible.

But there are more glaring examples of this. What do you get
when you multiply a number of newtons by a number of metres?
It could be either joules of energy or newton-metres of
torque, depending on what you're doing. You definitely
don't want to add those together!

I'm not sure how you teach a unit system to deal with things
like that. Somehow when you do the multiplication you have
to specify whether you're calculating energy or torque.

--
Greg

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