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This step is performed the same way as the wet mass determination. Double-click on the “Mass Dry (g)” column in the field adjacent to the sample to be analyzed. Follow the rest of the instructions in Wet Mass Determination by Analytical Balance, except that it applies to the dry mass measurement.
Dry Volume Determination by Helium Pycnometer
Calibration of the Pycnometer Cells
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If the user wishes, they can also look at a detail of the mass results as shown in Figure 28. This is a summary of all of the parameters used to determine the volume with the parameters labeled by their database names.
Figure 28. Review dry volume results window.
The volume_dry component is the volume of the sample. The volume_dry_container component is the volume of the sample and the container together. The pyc_stdev value is calculated from the individual measurements (in this case, three) done by the pycnometer.
Volume Determination by Caliper
Volume determination by caliper is best used on consolidated, high-porosity samples (e.g., coral or vesicular basalt) as part of Method D. It is not likely to give accurate results when used on soft sediments (Method A).
Double-click on the “Caliper Volume (cm3)” column in the field adjacent to the sample to be analyzed. This will invoke the caliper measurement window as shown in Figure 29. The user should select cube or cylinder depending on the sample to be measured with the precision caliper.
Figure 29. Caliper measurement entry screens.
Ensure that the sample being measured is the correct one and click either the “Cube” or “Cylinder” radio button. Make the measurements using the precision caliper (Figure 30). Enter the measurements for each dimension in centimeters. Once the measurements have been entered, click “Ok” and the result will be transferred to the main screen.