True Density Measurement of Solid Matter by Constant Volume Gas Pycnometer- A Review

Gas pycnometry is based on Boyle'slaw, there are three kinds of gas Pycnometer are constant volume, variable volume and comparative volume. Gas Pycnometer are being used to obtain the material true density/volume, apparent density/volume and porosities of the particles, drugs, pigments, and ceramics Measurement.Measuring the volume/density of Irregular shape, Porous and non-porous material. It is also control the temperature for the reference and sample chamber, and pressure transducers, valve is also inside a special chamber with a same temperature distribution. Here, it is said helium Pycnometer because the helium gas used for a pressurized gas because its atoms are too small so that easily passed in all pores of the material and define its porosity from its density. We can measure the density with porosity of any types of solid material and other material with high moisture content.