| http://www.w3.org/ns/prov#value | - G = V s 2 ??? ?? ??? Young ' ??? s ??? ??? modulus = ( 4 ??? G 2 - 3 ??? G ??? V 1 2 ??? ?? ) / ( G - V 1 2 ??? ?? ) [0086] in which G is a modulus of rigidity, Vs is a velocity of longitudinal wave, V1 is a velocity of transverse wave and ?? is a density of glass. [0087] (3) Poisson's ratio [0088] Calculated on the basis of the following equation using Young's modulus and modulus of rigidity.
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