Using gauge pressure defined as:
(10)
equation (9) is rewritten as:
(11)
1 CM
3
AND 2000 CM
3
UNITS
The 1 cm
3
and 2000 cm
3
pycnometers operate by filling the expansion chamber while the sample
cell remains at ambient pressure. After P
1
is equilibrated, the expansion valve opens to allow gas to
expand into the sample chamber and P
2
is equilibrated.
For the 1 cm
3
and 2000 cm
3
pycnometers, equation (1) becomes
and equation (2) becomes
A derivation similar to that above yields the working equation for the 1 cm
3
and 2000 cm
3
pycnometers
C Sample Volume Equation Derivation
AccuPyc II 1345 Operator Manual
134-42851-01 (Rev A) — Jan 2021
C - 3
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