True Volume – He
Helium Pycnometer is used to determine the true volume and true density of powders and bulk solids using high-precision volume measurements and density calculations. The true volume of a solid is calculated from the measured drop in pressure when a known amount of gas is allowed to expand into a chamber containing sample. Thus, the true volume obtained by pycnometer includes any pore volume accessible to the gas. Helium is the preferred gas, because it exhibits ideal gas behavior.
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