How do you test porosity of pumice?
Several methods can be employed to measure porosity, including the volume/density method (pore volume = total volume – material volume), water saturation method (pore volume = total volume of water – unsaturated water), water evaporation method (pore volume in cubic centimeters = weight of saturated sample in grams – weight of dried sample in grams), mercury intrusion porosimetry (several non-mercury intrusion techniques have been developed due to toxicological concerns, and the fact that mercury tends to form amalgams with several metals/alloys), and nitrogen gas adsorption (nitrogen gas adsorption in pores is measured either by volume or weight. This technique is suitable for materials with very fine pores).
