Shear Modulus formula:
  S = F.D₀/A.ΔD
where:
S: Shear Modulus, in Pa
D₀: Distance between Surfaces, in m
ΔD: Distance Sheared, in m
A: Area of Surface being Sheared, in m^2
F: Tangential Force Acting, in N

The shear modulus describes the shape elasticity of a material.