Editing Shear modulus (section)

==Shear waves==
[[File:SpiderGraph ShearModulus.GIF|thumb|upright=1.5|Influences of selected glass component additions on the shear modulus of a specific base glass.<ref>[http://www.glassproperties.com/shear_modulus/ Shear modulus calculation of glasses]</ref>]]
In homogeneous and [[isotropic]] solids, there are two kinds of waves, [[P wave|pressure waves]] and [[S wave|shear waves]]. The velocity of a shear wave, <math>(v_s)</math> is controlled by the shear modulus, 
:<math>v_s = \sqrt{\frac {G} {\rho} }</math>
where 
:G is the shear modulus

:<math>\rho</math> is the solid's [[density]].