The air, or at least some of its constituents, would cease to remain an invisible gas and would turn into the liquid state.

Before she can inform Carter everyone is knocked out by an invisible gas.

Each of them is filled with a rare, invisible gas.

Carbon dioxide was described in the video as an invisible and suffocating gas.

Stray waftures of invisible gases bit his eyes and made them sting.

The rewards of low carbon living are not just some notional reduction an abstract invisible gas.

A simple Bunsen burner can be used to show how two invisible gases form a very bright new state of matter.

The naturally-occurring invisible gas is present to some extent in every home in Britain.

The invisible, odorless gas was first discovered to have a physiological role in the body in 1987.

This ionization of the atoms would make the intergalactic gas largely invisible.