The image above represents planar density.
To compute for planar density, two essential parameters are needed and these parameters are Number of Atoms Centered on the Plane (N) and Area of the Plane (A).
The formula for calculating planar density:
PD = N/A
Where:
PD = Planar Density
N = Number of Atoms Centered on the Plane
A = Area of the Plane
Given an example;
Find the planar density when the number of atoms centered on the plane is 24 and the area of the plane is 3.
This implies that;
N = Number of Atoms Centered on the Plane = 24
A = Area of the Plane = 3
PD = N/A
PD = 24/3
PD = 8
Therefore, the planar density is 8 atoms/m².