## Density

The density or unit weight of a soil mass is defined as its weight per unit volume.### a. What is Bulk Density (๐พ)

The bulk density or moist density ๐พ is defined as the total weight (W) as a soil mass per unit of its total volume (V).**Thus,**

**๐พ =W/V**

### b. What is Submerged Density (๐พsub)

The submerged density or buoyant unit weight is defined as the submerged weight (Wd)sub of the soil solids per unit of total volume (V) of the soil mass.**Thus,**

**๐พsub =(Wd)sub / V**

**It is also expressed as,**

**๐พsub = ๐พsat - ๐พw**

Where

**๐พw**is the density of water and

**๐พsat**is the saturated density of soil.

###
c. What is Dry Density (**๐พd)**

The dry density or dry unit weight ๐พd is defined as the weight of solids (Wd) per unit of total volume (V) of the soil mass. **Thus,**

**๐พd = Wd / V**

###
d. What is Saturated Density (**๐พsat**)

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 (Wsat) to its total volume (V). **Thus,**

**๐พsat = Wsat / V**

###
e. What is Density of Solids (**๐พs)**

The density or unit weight of soil solids Is the weight of soil solids (Wd) per unit volume of the solids (Vs). **Thus,**

**๐พs = Wd /Vs**

*Read also:***Define Specific Gravity, Bulk Specific Gravity, Air Content and Percentage Air Voids**-
**What is Porosity, Void Ratio, Water or Moisture Content, And Degree of Saturation of Soil**