Definition: Not to be coerced; incapable of being compelled or
forced.
Definition: 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.
Definition: That can note be confined in, or excluded from,
vessels, like ordinary fluids, gases, etc.; -- said of the imponderable
fluids, heat, light, electricity, etc.
