Gas, vapor, clouds .... any difference? "Most of the water in the atmosphere is in the gas state called water vapor." (http://www.srh.noaa.gov/srh/jetstream/atmos/ll_rainman.htm) This quote was taken from a site dealing with weather. Does this mean that the average temperature of the water in the atmosphere is 100 degrees Celsius or more? Or is this statement confusing the gas state, with a particular way that liquids can exist, namely as clusters of molecules which are too small to be seen, and which, although their density is greater than that of air, are small enough to stay afloat in air for the same reason that particles of dust stay afloat, which, I assume, is due to being light enough to be lifted by random air currents. Comments?