 | JMDMT #1060 Microfossils of Cyanobacteria in Carbonaceous Meteorites The James M. DuPont Meteorite Collection - pressure and temperature of the reference chamber filled with He (Pr, Tr) are measured, after which He is allowed to expand to the sample chamber, and the resulting Ps and Ts are recorded and time-monitored to obtain stationary readings. Knowing the geometric volume of the sample and the residual pressure of the chambers before they are filled with He, the porosity (epsilon) of the sample can be calculated using ideal gas equations [7]. The system is calibrated with standard aluminum disks. The advantages of this method are that measurements are relatively fast, and the often rare and fragile meteorite samples are not disturbed (weathered) by water. In order to check the reliability of the instrument we compared He-pycnometer porosities with those obtained by |
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