My Chemistry book states that (talking about compressibility equation):
"A sample with Volume V is subjected to a pressure increase, delta P, and the resulting change in volume, change in V, is measured. The ratio is divided by V; thus, the tabulated value depends only on the substance being measured and not on the geometry of the sample."
I'm not sure exactly how they are drawing this conclusion. How does dividing by (-) volume cause the compressibility factor to not be dependent on the "geometry" of the sample?