Question

difference between density and relative density in a substance

Answer 1

This is the correct difference.
hope it will help

Answer 2

ok here is ur ans.

Density

1. Ratio of mass and volume
2. measured in (also commonly used)
3. Also regarded as specific weight
4. Unique for each body  

Relative density

Ratiois of  density of substance upon  density of reference substance (typically water )

Has no unit (dimensionless)

Also regarded as specific gravity

Relative density can be found compared with numerous other reference bodies