gasusually

Gasusually is a term used in some discussions of gas-phase modeling to describe a simplifying heuristic in which a multi-component gas mixture is treated as if its transport and thermodynamic properties are governed primarily by the largest constituent. The term is not part of standard thermodynamics and is not widely adopted in peer-reviewed literature.

Origin: The term is a modern informal neologism, sometimes found in notes and informal discussions in the 2020s, and has not achieved formal recognition in textbooks or journals.

In practice, gasusually would imply using property correlations or transport coefficients derived from the dominant species, while neglecting contributions from minor components. It may be invoked in educational demonstrations or preliminary simulations to reduce model complexity, especially when minority species lie well below a defined threshold.

Limitations include potential inaccuracies for reactive or strongly interacting mixtures, where trace components participate in key reactions or influence transport. The absence of a standard threshold or definition means the term remains informal and its applicability is highly context-dependent.

See also: gas mixture theory, transport properties, mixture-averaged models.