Compute \(\rho\), the in-situ density of air.

airRho(temperature, pressure, humidity)

Arguments

temperature

in-situ temperature, in \(^\circ\)C.

pressure

pressure in Pa (NOT kPa) -- ignored at present

humidity

ignored at present

Value

In-situ air density, in kg/m\(^3\).

Details

This will eventually be a proper equation of state, but for now it's just returns something from wikipedia (i.e. not trustworthy), and not using humidity.

References

National Oceanographic and Atmospheric Agency, 1976. U.S. Standard Atmosphere, 1976. NOAA-S/T 76-1562. (A PDF of this document may be available at http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19770009539_1977009539.pdf or http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=ADA035728 although neither link has proven to be reliable.)

Examples

degC <- seq(0,30,length.out=100) p <- seq(98,102,length.out=100) * 1e3 contour(x=degC, y=p, z=outer(degC,p,airRho), labcex=1)