Thom, saturated steam is a vapor. Superheated steam is a gas.
Both have the symbol H2O.
Both are uncondensed liquid if you appreciate that most gases turn to liquid
if you cool them enough.
Humidity is not any substance. It is a measure of the amount of water vapor
in the air.
Relative humidity is the ratio betweeen the amount of water vapor in the air
(at a given temperature) and the amount that would give 100% humidity.
(100% humidity is the maximum the air could hold at that temperature without
producing condensation.)

Re your question about the composition of cavitation bubbles I give a
personal opinion that they are mostly air. Water contains dissolved air
(otherwise fishes could not breathe) and when the action of the propeller
blades reduces the pressure some air has to come out of solution and shows
as bubbles. All that talk about boiling is just BS.
IMO
Edgar

"Thom Stewart" wrote in message
...
Paladin, or Gilly?

I see and awful lot of posting about "Boiling water", "Vapors &
vaporization" and I'm yet to see a mention of "Steam".

What is Steam? Is it a Vapor? Is it a Gas? Is it uncondenced liquid?

What is "Humidity?" Is it a Vapor or a Gas?

The Symbol for Water is H2O; Two parts Hydrogen, one part Oxygen, What
is the Symbol for Water Vapor? What is the Symbol for "Relative
Humidity?"

Relating it to Cavitation and "Useless Propeller" , what is the chemical
composition of those bubbles formed in Cavitation?

A bum ASA member is asking the greater MINDS of this discussion?




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