The density or unit weight of a soil mass is defined as its weight per unit volume.
a. What is Bulk Density (𝛾)
The bulk density or moist density 𝛾 is defined as the total weight (W) as a soil mass per unit of its total volume (V).
Thus, 𝛾 =W/V
b. What is Submerged Density (𝛾sub)
The submerged density or buoyant unit weight is defined as the submerged weight ( )sub of the soil solids per unit of total volume (V) of the soil mass.
It is also expressed as,
Where is the density of water and is the saturated density of soil.
c. What is Dry Density
The dry density or dry unit weight 𝛾d is defined as the weight of solids ( ) per unit of total volume (V) of the soil mass.
d. What is Saturated Density
When the soil mass is saturated, its bulk density is called the saturated density. Thus saturated density is the ratio of the total weight of a saturated soil sample ( ) to its total volume (V).
e. What is the Density of Solids
The density or unit weight of soil solids Is the weight of soil solids ( ) per unit volume of the solids ( ).