Re: vapor

["John S. Denker" <jsd@MONMOUTH.COM>]

Joseph E Sabol wrote:
...
> So, in my opinion, a "gas" is w/o any condensed phase present and a "vapor"
> is a gas in equilibrium with its liquid or solid or both.

That doesn't sound right to my ears.
I cite a few observations:
 -- Thoughtful experts refer to gaseous H2O as "water vapor"
    even in situations where it is nowhere near being in
    equilibrium with any condensed phase.  Examples include
    meteorology and astronomy.
 -- Thoughtful experts commonly refer to the "SVP" (Saturated
    Vapor Pressure) to designate a vapor that is in
    equilibrium with a nearby condensed phase.  They consider
    the word Saturated to be a necessary, non-redundant
    qualifier.
 -- Sodium vapor lamps and mercury vapor lamps operate nowhere
    near the saturated vapor pressure.

http://www.monmouth.com/~jsd/physics/vapor.htm