Volume compression measurements were made on eleven inorganic materials to a maximum pressure of 10,000 atm. Coefficients of the empirical equation -ΔV/V o =a(P -2000)+b(P-2000)2 were determined for the substances studied. Values of a in units of 10-6 atm-1 and b in units 10-10 atm-2 are as follows: Monel-a=0.62 b=0; Waspalloy-a=0.65, b=0; sapphire-a=0.34, b=0; rutile-a=0.46, b=0; spinel-a=0.39, b=0; BaS-a=3.99,b= -1.6;CaS-a=2.48, b= -1.1; B2O3 (crystalline)-a=3.24, b=-0.29; H3BO3-a=11.65, b= -3.2; As2O3 (glass)-a=8.34, b= -1.7; and As2S3 (glass)-a=8.12, b= -2.8.