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Re: SI and nothing else



In other words, these Planck's units, or the GeV-based units, can not
possibly, even in principle, be used in a starting chapter of an introductory
physics course. Too much previous knowledge is required to make them
meaningful. Let us agree that at least three basic units are necessary to
make a useful transition from common knowledge and experience to physics.
I am talking about mechanics. And at least four are needed to include E&M,
when we want to each physical quantity
when we want to each physical quantity to be dimenionally unique. CGSE had
three units and cm was shared by distance and by capacity.