The function estimates air pressure (kPa) as a function of elevation (Engineering ToolBox 2003) .
airpressure_from_elev(elev)numeric elevation (meters).
numeric air pressure (kPa).
Engineering ToolBox (2003). Atmospheric Pressure vs. Elevation above Sea Level. https://www.engineeringtoolbox.com/air-altitude-pressure-d_462.html.
Other utility functions:
azimuth_angle(),
day_of_year(),
daylength(),
dec_angle(),
solar_noon(),
temperature conversions,
zenith_angle()
airpressure_from_elev(elev = 1500)
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