Helium pycnometry measures true (absolute) and skeletal (apparent) volume and density.
These terms are defined as follows:
|True (absolute) density||=||mass
(excluding open and closed pores)
|Skeletal (apparent) density||=||mass
(including open and closed pores)
The instrument measures the volume of a material by gas displacement using the volume-pressure relationship of Boyle’s Law. An inert gas such as helium or nitrogen is used as the displacement medium. The sample is placed in a sealed cup of a known volume. This cup is then placed into the sample chamber. Gas is introduced to the sample chamber and then expanded into a second empty chamber with a known volume. The pressure observed for filling the sample cell and discharging the gas into the second chamber are measured and then the volume is calculated. The density is determined by dividing the sample weight by the volume measured.
To learn more about the Accupyc please contact Katya Bazilevskaya at email@example.com
To visit the manufacturer’s website for this instrument, visit:
More from Wikipedia: https://en.wikipedia.org/wiki/Gas_pycnometer