06/05/2021 (Sat) 17:09:41
As an example of a mostly meaningless constant, do you know what a slug is? It "weighs" about 32lbs but ... somewhere, they "decided" that kilograms are mass -- it won't change even on foreign planets (a mole of carbon-12 'weighs' twelve kilograms, by definition) but you will weigh more, or less, because you're using muscles to lift your mass off the doggone couch!
Pounds, they say, is a unit of force. It equates to newtons in metric. About one and a third newton-meters per foot-pound of leverage.
So, they said, if you can convert mass to pressure (One kilo exerts 9.8N in 1G, the amount of pressure we're all used to) can you convert pressure back to mass? Things accelerate at 32.2 feet per second per second in 1G, so one unit of SAE mass needs to apply 32.2lbs of pressure sitting there on your desk.
That hunk of steel? Has 1 slug of mass.