Micromeritics AccuPyc 1330 Quick Reference Manual page 99

APPENDIX B AccuPyc 1330
When the valve is opened. the pressure will fall to an intennediate value.
P2.
and the mass bal-
ance equation becomes
Substituting from equations (1) and (2) into (3):
or
then
p.-P
2
VCELL - VSAMP
=
P P VEXP
2- I
Adding and subtracting p. in the denominator and rearranging gives
Dividing by (P. -
Pv
in both the numerator and denominator
or
V EXP
VSAMP
=
VCELL- P _P
-1-
I •
p.-P
2
Since Pb P
2 •
and p. are expressed in equations (1) through (9) as absolute pressures and equa-
tion (9) is arranged so tbat p. is subtracted from both
PI
and
P2
before use. new
Pig
and
P2g
may be redefined as gauge pressures
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
B-2
15 Dec 89