Linked from
The 16 pages that link to Poisson's ratio, each with the reason it gives.
Strain (mechanics)Related: It relates lateral contraction to axial extension.
Contact mechanicsRelated: It affects the effective stiffness of two bodies pressed together.
Thermal shockRelated: It influences the stress state produced by constrained thermal expansion.
Shear modulusRelated: It links shear modulus to Young's and bulk moduli in isotropic materials.
Bulk modulusRelated: It helps connect bulk modulus to other elastic constants in isotropic solids.
Rayleigh waveRelated: It influences the relation between Rayleigh-wave speed and shear-wave speed.