Appendix C ASAP 2460 Operator’s Manual
C-2 246-42800-01 - Aug 2013
Relative Pressure Calculations
If Po is measured in the Po tube, the current pressure is measured in the Po tube when each point is
taken, and used to calculate relative pressure for that point:
Equation of State
The ideal gas law relates pressure, volume, temperature, and quantity of gas.
where
P = pressure
R = a constant that depends on the units of n
For n in cm
3
, STP
For n in moles, R = 8.3145 J mol
-1
K
-1
T = temperature
V =volume
z = compressibility factor for the gas at the given pressure and temperature
The real gas equation of state
n
PV
RTz P T
-------------------------
=
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