[True Density] Understanding Porosity and Density of Rocks

Pore space volume was determined using a helium pycnometer. The helium pycnometer makes use of Boyle’s Law (P1V1=P2V2) and helium gas, which quickly penetrates small pores and is nonreactive, to determine the solid portion of a sample. The core is placed in a sample chamber of known volume. A reference chamber, also of known volume, is pressurized. The two chambers are then connected, allowing the helium gas to flow from the reference chamber to the sample chamber. The ratio of the initial and final pressures is used to determine the volume of the sample solid. The pore volume is the differenc......

[True Density] What Is True Density and How to Measurre It

The true or real density is defined as the ratio of the mass to the volume occupied by that mass.

[True Density] Density of Porous Solids

That is helium at a measured pressure and temperature in a calibrated volume is released into a sample vessel of a known empty volume and the pressure re-measured. The volume of the sample vessel with the sample inside is determined from the resulting pressure. The difference between the empty sample vessel volume and the measured volume gives the skeletal volume of the sample and together with the samples mass, the skeletal density of the porous material.