Jgiacalo - You are dead right, and all this has been known for years, I dont know what the french researcher is on about (about from absconding some funding). Ive been observing humidity behaviour for some time and it has some unintuitive behaviour - water vapour actually permeates air like a gas and that the air doesnt need to mix via wind for the humidity to spread. That is you can have two rooms of different humidity air joined by a small crack, and with no major air movement between the two volumes, the humidity (water vapour) can spread within seconds.
