Air density (kg/m³) and density altitude from pressure, temperature and humidity.
Pressure (mbar), temperature (°C) and relative humidity (%).
We compute moist-air density in kg/m³ using the partial-pressure method.
Lower density (hot, humid, high altitude) means less oxygen and less power — the engine wants less fuel.
Air density (kg/m³) sets how much oxygen enters the engine per stroke. Denser air = more fuel needed and more power potential; that is why MAF/MAP and fuel maps depend on it.
The altitude at which the standard atmosphere has the same density as your current conditions. High density altitude (hot/humid/high) behaves like thinner mountain air.
Water vapour is lighter than dry air and displaces oxygen, so humid air is less dense and makes slightly less power.
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