The bulk density is illustrated by the image below.

To compute for bulk density, four essential parameters are needed and these parameters are **Dried Weight (W), Density of Water (ρ _{w}), Soaked Weight (W)** and

**Suspended Weight (S).**

The formula for calculating bulk density:

BD = ^{Dρw}/_{W – S}

Where:

BD = Bulk Density

D = Dried Weight

ρ_{w} = Density of Water

W = Soaked Weight

S = Suspended Weight

Let’s solve an example;

Find the bulk density when the dried weight is 6, the density of water is 10, the soaked weight is 14 and the suspended weight is 9.

This implies that;

D = Dried Weight = 6

ρ_{w} = Density of Water = 10

W = Soaked Weight = 14

S = Suspended Weight = 9

BD = ^{Dρw}/_{W – S}

BD = ^{(6)(10)}/_{(14 – 9)}

BD = ^{(60)}/_{(5)}

BD = 12

Therefore, the **bulk density **is **12g/cm³.**

**Calculating the Dried Weight when the Bulk Density, the Density of Water, the Soaked Weight and the Suspended Weight is Given.**

D = ^{BD(W – S)} / _{ρ}_{w}

Where:

D = Dried Weight

BD = Bulk Density

ρ_{w} = Density of Water

W = Soaked Weight

S = Suspended Weight

Let’s solve an example;

Find the dried weight when the bulk density is 10, the density of water is 4, the soaked weight is 8 and the suspended weight is 5.

This implies that;

BD = Bulk Density = 10

ρ_{w} = Density of Water = 4

W = Soaked Weight = 8

S = Suspended Weight = 5

D = ^{BD(W – S)} / _{ρ}_{w}

D = ^{10(8 – 5)} / _{4}

D = ^{10(3)} / _{4}

D = ^{30} / _{4}

D = 7.5

Therefore, the **dried weight **is **7.5g.**