Pseudoair

[…] in which the air or pseudoair is thick and viscous; in which the only substance common to both sets of dimensions and thus available for combat purposes is a synthetic material so treated and so saturated as to be of enormous mass and inertia.

Source: wiktionary

One electrode is a Pt electrode exposed directly to a sample gas, while the other is a Pt pseudoair electrode which is covered with a CO oxidation catalyst.

Source: wiktionary

The two idealized test gases could be considered pseudoair and pseudohelium; both follow the gamma-law and have the same specific heat ratio.

Source: wiktionary

There was a brief burst of disorientation, nausea and vertigo, followed by a second rush of pseudo-air, and then I was standing.

Source: wiktionary