How to Determine Superheated Ammonia Vapor Density?
How to Determine Superheated Ammonia Vapor Density?
(OP)
How do you determine the vapor density of superheated ammonia vapor at the following conditions:
- pressure = 15 psig
- temperature ~ 130 deg F
- pressure = 15 psig
- temperature ~ 130 deg F





RE: How to Determine Superheated Ammonia Vapor Density?
The value is 0.081121 lbm/ft3 taken from
press on fluid properties.
RE: How to Determine Superheated Ammonia Vapor Density?
MAPower:
You could also use the ideal gas law to calculate the density:
lb/ft3 = (MW/10.73)(P/T)
where:
MW = molecular weight = 17.03 for ammonia
P = absolute pressure in psia = 15 + 14.696 = 29.696 psia
T = Temperature in deg Rankine = 130 + 460 = 590 deg R
lb/ft3 = (17.03/10.73)(29.696/590) = 0.0799
which is within 1.5% of the NIST value of 0.081121 given you by user 25362.
You might find it useful to read:
www.air-dispersion.com/formulas.html
Milton Beychok
(Visit me at www.air-dispersion.com)
.