Given a core sample (cores are cylindrical in shape) having a diameter of 3 inches and a length of 6 inches, you are to estimate porosity. Figure 1 shows two identical chambers having the same volume such that V1=V2=1000cm3. These chambers are connected through a valve. First, chamber one is vacuumed and then pressurized to Pc=50p sig with helium gas. Next the core sample is placed in the second chamber and then again air is evacuated with vacuum. Finally the valve is opened. Now the pressure in both chambers is equal to Pd=28.1psig. Estimate the porosity of the core sample. Figure 1: Schematic of the system described in problem 1