
Calculation of the Bulk Modulus of Glasses 
The bulk modulus, K, may be determined from Young's modulus, E, and the shear modulus, G, by the equation K = G·E / (9·G  3·E).
Influences of selected glass component additions on the bulk modulus of a specific base glass, calculated from the Young's modulus and the shear modulus. The diagram will change nonlinearly for other base glasses. (click image to enlarge)