# Volume Charge Density (ρ)

When the electric charge is continuously distributed throughout a region, the volume charge density at a point is defined as the charge Δqi in a small volume element ΔVi divided by the volume with the limit of this ratio taken as the volume shrinks to zero around the point.

# Surface Charge Density (σ)

When the charge is distributed over a surface, the surface charge density is defined as the charge per unit area.

# Line charge density (λ)

When the charge is distributed over a line, the line charge density is defined as the charge per unit length.