The image above represents the number concentration.

To compute for the number concentration, two essential parameters are needed and these parameters are **Number of Entities of the Constituent (N)** and **Volume (V).**

The formula for calculating the number concentration:

C = ^{N} ⁄ _{V}

Where;

C = Number Concentration

N = Number of Entities of the Constituent

V = Volume

Let’s solve an example;

Find the number concentration when the number of entities of the constituent is 12 and the volume is 24.

This implies that;

N = Number of Entities of the Constituent = 12

V = Volume = 24

C = ^{N} ⁄ _{V}

C = ^{12} ⁄ _{24}

C = 0.5

Therefore, the **number concentration** is **0.5 m ^{-3}.**

**Calculating the ****Number of Entities of the Constituent when Number Concentration and Volume is Given.**

N = VC

Where;

N = Number of Entities of the Constituent

C = Number Concentration

V = Volume

Let’s solve an example;

Find the number of entities of the constituent when the number concentration is 18 and the volume is 14.

This implies that;

C = Number Concentration = 18

V = Volume = 14

N = VC

N = 14 x 18

N = 252

Therefore, the **number of entities of the constituent** is **252 m ^{-1}.**