Underlying physics of partial pressures

[soundgarden]

How do gases exist at partial pressures in a mixture. Moisture in the air is superheated steam, yet at a temperature well below atmospheric boiling point, implying that the moisture in the air is at very low pressures. How does it maintain this state?

 

[kazx9r]

Maybe it hasn't reached equilibrium yet, that's got to be in the thermo book.

 

[Yuri B.]

Evaporation is not (yet) boiling, vapours is not steam. An example of slightly superheated steam in everyday life is the pressurised steam over the boiling water in a closed tea kettle.