A clean sandstone core sample 2" in diameter and 12" long weighs 1407.9 g. When the sample was saturated completely with fresh water, its weight increased to 1494.4 g. With both ends of the sample open to the atmosphere, the sample was then placed under a confining pressure of 500 psig. This caused 0.125 cm3 of water to squeeze out of the sample. The confining pressure was then increased in steps and the total volume of squeezed water was recorded as in the table below. What is the pore compressibility of the core sample? Confining Pressure, psia Total Volume of Squeezed Water, ml 0 0 500 0.125 1000 0.260 1500 0.350 2000 0.500 2500 0.650 3000 0.760