201
Physics, Astronomy & Cosmology / Re: Is mass a number?
« on: 30/05/2022 11:56:33 »Most physical quantities require Units......mass is one quantity that has units
as a ratio of two numbers with the same units....the atomic mass unit is dimensionless
But by that argument a mass in kg or pounds or anything else is dimensionless too, as it's also the ratio of a mass to that of a standard. The point about dimensions is that they specify which standard you're using as the denominator in your 'dimensionless' ratio.
75kg is just shorthand for "if the reference is the kilogram, the mass is 75", or "the mass is 75 times that of the kilogram".
Then just to confuse the issue, there are units like the radian and the bel......