Concept:
Mass density of soil is defined as the ratio of mass of soil to the volume of soil sample taken. It is expressed in Kg/m^{3}, gm/cm^{3}.
Unit weight of soil is defined as the weight of soil per unit volume of soil sample.
We know that
Weight, W = Mg; Where M is the mass of soil and g is the acceleration due to gravity.
It has SI unit either ‘N’ or ‘kN’. So unit weight is expressed in either N/m^{3} or kN/m^{3} in SI unit system.
Note:
A few more soil parameters and their unit in which are expressed are tabulated below:
Parameter |
Unit (SI) |
Coefficient of Volume Change, m_{v} |
m^{2}/kN |
Coefficient of Consolidation, C_{v} |
m^{2}/sec |
Coefficient of Compressibility, a_{v} |
m^{2}/kN |
Shear Strength |
N/m^{2} |