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Appendix B
Equation A-4 — Air Density
Equation A-4 — Air Density
Air Density (
AIR
P ) in units of g/cm
3
, is calculated as follows;
()()
()()
()
texUxPx
t
air
+−=
+−
15.273/6.49902210004646.0
15.273/56.5315
ρ
where:
P
= Barometric Pressure, (mmHg)
t
= Air Temperature, (ºC)
U = Relative Humidity, (%RH)
Nitrogen Density — English Units (0 to 1000 PSIG)
To calculate the density of Nitrogen at pressures from 0 psig to 1000 psig, use the following
equation;
()( )
PxxinlbmDENSITY
63
10826.2/
−
=
where;
PRESSUREP = in psi absolute (if P is in gauge, convert it to an absolute value by
adding barometric pressure, e.g.
7.14+P
)
Nitrogen Density — English Units (1,000 to 15,000 PSIG)
To calculate the density of Nitrogen at pressures from 1,000 psig to 15,000, use the following
equation;
()( )( )( )
2
11643
109.460691074396.21037465.2/ PxPxinlbmDENSITY
−−−
−+=
where;
PRESSUREP =
in psi absolute (if P is in gauge, convert it to an absolute value by
adding barometric pressure, e.g.
7.14+P
)