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Compressibility Factor Charts

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n-hexane
carbon dioxide
ethane
nitrogen
hydrogen
The compressibility factor chart plots the compressibility factor
Z
, equal to
PV
RT
, where
V
is the volume per mole, versus the reduced pressure
P
r
for several values of the reduced temperature
T
r
. The reduced pressure and temperature are defined by
P
r
=P/
P
c
and
T
r
=T/
T
c
, respectively, where
P
c
is the critical pressure and
T
c
is the critical temperature. Use buttons to select one of five molecules, and move the black dot to display the compressibility factor curve (blue) for any value of
T
r
between 1.0 and 1.8. The
Z
and
P
r
values for the location of the black dot are displayed on the chart. For an ideal gas,
Z=1
(green line).
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