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. . . Defining a system of units where a constant is equal to unit, does
not make it non-arbitrary. The "arbitrary constants" are buried in the
choice of units. There are consistent sets of English units, which used
to be taught, where the arbitrary constant in N2 is also unity. Ludwik's
argument is, I think, circular, because the SI (and many other systems of
units) aredefined so that there is no "k" in N2. The K_g (along with K-e
and K-m) is incorporated into the Newtonian constant G.