30. What is the unit of relative density? A.Kg/m B.Kg/m2 C.Kg/m3 D.It has no unit
Option D Solution: Relative density is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material (i.e., water). It is usually measured at room temperature (20 Celcius degrees) and standard atmosphere (101.325kPa). It is unitless.
