This quantity is expressed as a quintic polynomial in the empirical Nafe-Drake relation. Graphical methods of estimating this quantity include the Nettleton method. The radial gradient in this quantity is computed by the Adams–Williamson equation. (15[1])Bulk values (-5[1])of this quantity can be measured by observed Compton backscattering signals using a gamma-gamma logger. The product of this quantity with a medium's (*) P-wave velocity gives the medium’s acoustic impedance. Inhomogeneities in this quantity in the Earth compared to a uniform spheroid produce gravity (10[1])anomalies. (10[2])The speed (10[3])of sound (10[2])in a material equals the square root of the material's bulk modulus divided by its value for this quantity. For 10 points, high porosity can lower a rock's value of what quantity, (10[2])which multiplies volume and little g to give the buoyant force? ■END■