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37 lines
1.1 KiB
Plaintext
37 lines
1.1 KiB
Plaintext
/*
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* Author: Ruthberg
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*
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* Calculates the air density
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*
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* Arguments:
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* 0: temperature - degrees celcius <NUMBER>
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* 1: pressure - hPa <NUMBER>
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* 2: relativeHumidity - value between 0.0 and 1.0 <NUMBER>
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*
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* Return Value:
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* 0: density of air - kg * m^(-3) <NUMBER>
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*
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* Return value:
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* None
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*/
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#include "script_component.hpp"
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private ["_temperature", "_pressure", "_relativeHumidity"];
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_temperature = _this select 0; // in C
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_pressure = _this select 1; // in hPa
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_relativeHumidity = _this select 2; // as ratio 0-1
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_pressure = _pressure * 100;
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if (_relativeHumidity > 0) then {
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private ["_pSat", "_vaporPressure", "_partialPressure"];
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// Saturation vapor pressure calculated according to: http://wahiduddin.net/calc/density_algorithms.htm
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_pSat = 6.1078 * 10 ^ ((7.5 * _temperature) / (_temperature + 237.3));
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_vaporPressure = _relativeHumidity * _pSat;
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_partialPressure = _pressure - _vaporPressure;
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(_partialPressure * DRY_AIR_MOLAR_MASS + _vaporPressure * WATER_VAPOR_MOLAR_MASS) / (UNIVERSAL_GAS_CONSTANT * KELVIN(_temperature))
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} else {
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_pressure / (SPECIFIC_GAS_CONSTANT_DRY_AIR * KELVIN(_temperature))
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};
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