Density is one of the most basic physical parameters of powder materials, which directly affects the quality, performance, and application of the powder material. The gas pycnometry uses the gas displacement method for the measurement of volume, true density, solid content, and open cell content of solid materials.
What is the gas displacement method?
The gas displacement method is a reliable and widely-used technique to measure the density of solid, porous, liquid, and semi-solid materials. This approach finds widespread application in a wide range of industries, including pharmaceuticals, powder metallurgy, coating, foam, cosmetics, construction, etc.
The fundamental principle of the gas displacement method is based on Boyle's law, which establishes an inverse relationship between the pressure and volume of a gas at a constant temperature. The method involves expanding gas from one chamber to another, with both chambers having known volumes, under isothermal conditions. Initially, the weight of the sample is determined and loaded into the sample chamber. Then, the sample chamber is pressurized to a predetermined value. Subsequently, the analysis gas is expanded into a second chamber, known as the reference chamber. Finally, the equilibrated pressures for both steps are recorded by the gas pycnometer and the density is calculated using these values.
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