Direct porosity measurement using single chamber gas pycnometers

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Abstract

During porosity measurements, error most certainly originates from the incorrect determination of the samples total geometrical volume. This uncertainty will affect all porosity measurement procedures with greater degree on the indirect methods. However, there is a solution where the effect of the sample volume can be eliminated. If both the matrix and pore volume of the sample is measured the porosity can be calculated using those values instead of the bulk and pore volumes. The two-chamber gas pycnometer is the most used method for determining the matrix volume. The procedure applies Boyle's principle which can also be used to determine the pore volume directly using a single chamber construction, if the difficulties discussed in this article are solved.