Question

density kg/ m, the relative density is

Answer 1

relative density = density of substance / density of volume

hope dis ans helps u :)

Answer 2

density is mass/area
so SI unit of mass is kg
and SI unit of area is m^2
so SI unit of density is kg/m^2

in the same way relative density is
density of object/density of a standard object ( generally water)
SI unit of density is kg/m^2 ( as discussed above)
so SI unit of relative density is (kg/m^2) / (kg/m^2)
both will get cancelled
so the relative density have no unit