A pycnometer is simply a bottle which can be precisely filled to a specific, but not necessarily accurately known volume, V.
12.
The particle density of a powder, to which the usual method of weighing cannot be applied, can also be determined with a pycnometer.
13.
Derivation of the " working equation " and a schematic illustration of such a gas expansion pycnometer is given by Lowell " et al . ".
14.
The volume of the powder is determined by the difference between the volume as shown by the pycnometer, and the volume of liquid added ( i . e . the volume of air displaced ).
15.
Gunpowder's specific gravity is 1.70 1.82 ( mercury method ) or 1.92 2.08 ( pycnometer ), and it has a pH of 6.0 8.0.
16.
The difference in change of pressure represents the volume of the sample as compared to the reference sphere, and is usually used for solid particulates that may dissolve in the liquid medium of the pycnometer design described above, or for porous materials into which the liquid would not fully penetrate.
