Gas propagation model
Model the behavior of electromagnetic radiation from a point of transmission as it
travels through gas  by using a
object. Propagation models for gas are valid from 1 to 1000 GHz, assume line-of-sight (LOS)
conditions, and disregard terrain, the curvature of the Earth, and other
Gas object by using the
Temperature— Air temperature
15(default) | scalar
Air temperature, specified as a scalar in degrees Celsius (C).
AirPressure— Dry air pressure
101300(default) | scalar
Dry air pressure, specified as a scalar in pascals (Pa).
WaterDensity— Water vapor density
7.5(default) | scalar
Water vapor density, specified as a scalar in grams per cubic meter (g/m3).
Display the coverage area for a transmitter in hot air. Specify the air temperature as 35 degrees Celsius.
pm = propagationModel("gas","Temperature",35); tx = txsite("Name","Apple Hill","Latitude",42.3001,"Longitude",-71.3604); coverage(tx,pm)
 International Telecommunications Union Radiocommunication Sector. Attenuation by atmospheric gases. Recommendation P.676-11. ITU-R, approved September 30, 2016. https://www.itu.int/rec/R-REC-P.676-11-201609-S/en.
 Seybold, John S. Introduction to RF Propagation. Hoboken, N.J: Wiley, 2005.