Gas porosimeter is used to determine porosity of sedimentary rock sample taken at 250 m depth through the whole core and sidewall core method. The dimension of the sample is 5 cm diameter and 10 cm long. Analyse and elaborate the porosity of the sample based on the experimental data below; Item Initial pressure Equivalent pressure Chamber diameter Chamber height Medium Testing Atmospheric pressure Standard pressure Whole Core Method 6.5 bar 3.05 bar : 10 cm : 15 cm : Helium : 1 bar : 1.013 bar Side Core Method 6.5 bar 3.0 bar