Physical quantities should exist in a separate namespace than units

[whitequark]

> air density
air: Average molecular weight of air. density = 1 kilogram / meter^3
> gold density
gold: density = 1 kilogram / meter^3
> silver density
silver: density = 1 kilogram / meter^3

[tiffany352]

Okay, that's pretty bad. It's multiplying air by density to make density amount of air, and density is a physical quantity. The substance printer then prints the amount and uses the quantity name instead of "amount".

The correct query would be using the of operator, but it looks like rink doesn't actually know the density of any of those substances.

I need to make physical quantities exist in a separate namespace from regular units. Maybe I could even make it so that multiplying a unit by a quantity works the same as the of operator.

[whitequark]

Thank you!