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BasicAirData

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Air density is calculated with the CIPM 91 method. Open and free code.
Inputs to the calculation are pressure, temperature and relative humidity.
Output are Air density, Vapor pressure, Compressibility Factor, Viscosity and Speed of Sound
You find the algorithm details in this link 
http://www.basicairdata.eu/air-properties.html
Main reference site 
http://www.basicairdata.eu/android-air-properties.html

Free source online available

https://github.com/BasicAirData/AirProperties


Air Properties

Versi Terkini Air Properties