ilmatiiveyden
Ilmatiiveyden is a term used in atmospheric science to describe the effective density of an air mass, incorporating not only the molecular density of dry air but also the influence of humidity and suspended particulates. The concept is meant to capture how the overall weight and light-attenuating properties of the air behave in real-world conditions, where moisture and aerosols modify buoyancy, sound propagation, and visibility.
Etymology and scope: The word combines ilma or ilmat (air) with tiheys (density) in a Finnish-inspired formation,
Measurement and interpretation: In practice, ilmatiiveyden is estimated from standard meteorological inputs such as pressure, temperature,
Applications and significance: The concept is used to improve representations of buoyancy-driven flows, wind shear, and
Critique and alternatives: Some meteorologists treat ilmatiiveyden as redundant with established quantities (air density and haziness
See also: air density, humidity, aerosol concentration, visibility, atmospheric optics.