density and gravity

1. Chapter 3
Density And Specific Gravity

2. Density is defined as ‘mass per unit volume’.
For example, the mass density of
Fresh Water = 1000 kg per cubic metre or 1.000 tonne/m3
Salt Water = 1025 kg per cubic metre or 1.025 tonne/m3
The specific gravity (SG) or relative density of a substance is defined as
the ratio of the weight of the substance to the weight of an equal volume
of fresh water.
Specific gravity : “S.G”
Relative Density : “R.D” = density of the substance
density of freshwater

3. Density of Fresh Water
Specific Gravity : “S.G”
Relative Density : “R.D”
Density of the substance
=
Specific Gravity : “S.G”
Relative Density : “R.D” =
Density of the substance
1000
The density of FW = 1000 kg per cu. m
 The relative density of salt water = 1025/1000 = 1.025
 The relative density of oil = 900/1000 = 0.9
 The relative density of fresh water = 1000/1000 = 1

4. Density And Specific Gravity

5. Density And Specific Gravity

6. Density And Specific Gravity

7. Density And Specific Gravity