This function calculates the air-density based on the papers:
1)'Equation for the Determination of the Density of Moist Air'
P.Giacomo, Metrologia 18, 33-40 (1982)
2)'Equation for the Determination of the Density of Moist Air'
R.S. Davis Metrologia 29, 67-70 (1992)
t = ambient temperature (ºC)
hr = relative humidity [%]
p = ambient pressure [Pa]
06/10/2006 Jose Luis Prego Borges
Sensor & System Group, Universitat Politecnica de Catalunya, Spain
Excellent! Easy to use and well developed and cited!
missing the temperature and pressure limitations for this function?
I tried to use it to get air density in a simulation of a combustion engine with 1>=hr>=0, but it seems that after 3.5e6Pa and 1500K the function doesn't work. It returns negatives densities. I guess thats the limitations, just so it is here.
other wise great function :D
good for reference tehnical specification
thank you for your work
Good work! Although the difference is minor, the correct conversion between degrees Celsius and Kelvin is:
t90 / °C = T90/K - 273.15
Check the ITS-90 page on:
Why not vectorize it so you can put in a list of numbers? (simply use .* instead of * etc.)
Why is f0 in the argument list?
The help should mention what "ro" is and in what units it is expressed.
End the calculations with a semi-colon to suppress the display.
For some (most) values ro is negative? Can that be true?
You should check for unphysical inputs (e.g., hr>100%).
New vectorized version 1.1