ISSN: 0090-3973
Published Online: 12 January 2005
Page Count: 4

Optimum Design of Gas Pycnometers for Determining the Volume of Solid Particles

Tamari, S
Instituto Mexicano de Tecnología del Agua (IMTA),

Aguilar-Chávez, A
Instituto Mexicano de Tecnología del Agua (IMTA),

(Received 29 June 2004; accepted 20 September 2004)

Abstract

Gas pycnometry is based on Boyle-Mariotte's law. There are three kinds of gas pycnometers reported in the literature: “constant-volume,” “variable-volume,” and “comparative.” These instruments are widely used to determine the volume—and thus the density—of granular, porous, or soluble compounds (e.g., rocks, coal, pigments, ceramic, drugs, seeds). However, many users do not know the optimum-use conditions of their gas pycnometer. This work provides a synthesis of recent studies about the optimum design of the gas pycnometers. It seems possible to use commercially available components for constructing gas pycnometers that can determine the volume of solid particles with a relative standard uncertainty smaller than 0.25 %. Compared to other gas pycnometers, the constant-volume pycnometer presents several practical advantages.

Keywords:
volume determination, gas pycnometer, optimum design, error analysis, helium pycnometry, particle density

Paper ID: JTE12674
DOI: 10.1520/JTE12674
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