Depends on If it's absolute or relative. Vacuum in any unit is zero in absolute pressure. Vacuum in any unit is -normal air pressure in relative pressure.
g/m³ or mg/l
I don't believe that there is such a thing as an 'ampere per lumen'. An ampere is the SI unit of current, whereas the lumen is the SI photometric unit for luminous flux. There is no direct relationship between the two.
You cannot 'measure' light. However, there is the light-year, a measurement of the distance light can travel in one year. there are many. Lumens, cadlepower, foot candles and candelas. There are probably a few more.
A geological unit is an identifiable - "mappable" volume or layer of rock where the relative age can be determined. The link below gives more detail.
Relative
%
Relative Value Unit
Relative Value Unit
Relative permeability does not have a unit as it is a dimensionless quantity that describes how easily a fluid can flow through a porous medium (such as a rock or soil) relative to the fluid's flow in a vacuum. It is typically represented as a dimensionless ratio ranging from 0 to 1.
It's a unit of energy, not light or weight.
The ratio of thee density of a substance of the density of a standard , usually water for a liquid or solid and aur for a gas. The SI unit of relative density is g/ m3
A light-year is a unit of distance, not a unit of time.
No units - its a ratio.
If the unit rate exists, it is the ratio of one variable relative to the other.
Depends on If it's absolute or relative. Vacuum in any unit is zero in absolute pressure. Vacuum in any unit is -normal air pressure in relative pressure.
The unit of density is kilograms per cubic meter (kg/m^3) or grams per cubic centimeter (g/cm^3). The unit of relative density, also known as specific gravity, is dimensionless as it is the ratio of the density of a substance to the density of a reference substance (typically water).