Question

what is the amount of a substance and luminous intensity?

Answer 1

Amount of substance can be the measure of its mass or the amount of matter contained in it.

Luminous intensity is the ability to emit light into a given direction, or it is the luminous flux that is radiated by the light source in a given direction within the unit of the spatial angel. The luminous flux per unit solid angle (per steradian), as measured in a given direction relative to a light source. Its unit is the candela.