2. (Physics) Not capable of being reduced to the form of a liquid by
pressure; -- said of any gas above its critical point; -- also
particularly of oxygen, hydrogen, nitrogen, and carbon monoxide,
formerly regarded as incapable of liquefaction at any temperature or
pressure.
3. (Physics) That can note be confined in, or excluded from, vessels,
like ordinary fluids, gases, etc.; -- said of the imponderable fluids,
heat, light, electricity, etc.
In`co*ex*ist"ence (?), n. The state of not coexisting. [Obs.] Locke.