Example 1: A soil has void ratio = 0.72, moisture content = 12% and Gs= 2.72. Determine its
(a) Dry unit weight
(b) Moist unit weight, and the
(c) Amount of water to be added per m3 to make it saturated.
Use 
Solution:
(a) 
= 15.51 kN/m3
(b) 
= 
= 17.38 kN/m3
(c) 
= 
= 
= 19.62 kN/m3
Water to be added per m3 to make the soil saturated
= 
= 19.62 – 17.38 = 2.24 kN
Example 2: The dry density of a sand with porosity of 0.387 is 1600 kg/m3. Find the void ratio of the soil and the specific gravity of the soil solids. [Take 
]
n = 0.387
= 1600 kg/m3
Solution:
(a) e = 
= 
= 0.631
(b) = 
Gs = 