I'm about to make your brain a super nova. :) Being 1 mile above sea=20 level at Denver, the air density is less than the 780' above sea level=20 here in Northern Ohio. That must enter into the equation also. :) But=20 knowing the air temperature, and probably density, i.e. altitude and=20 temperature, the saturated water in the air can be calculated x %=20 relative humidity will give you the absolute number. I believe this is=20 the turf of physicist and mechanical engineers, the HVAC (Heating,=20 Ventilating, Air conditioning variety). ASHRAE is the professional=20 organization of this area. They have handbooks, and design information. On 11/23/13 5:29 PM, YES NOPE9 wrote: > Is there a sensor to measure the degree of humbleness a human ....... > > Actually , I have question about capacitive humidity sensors. I was told= that they typically measure relative humidity ( RH ). I don't get that. = Why would they not measure AH ( absolute humidity ) ... that is .... the am= ount of moisture per volume of air ( grams per cubic meter ). Or does the = capacitor accept water contingent on the temperature ? My visualization w= as two giant capacitor plates with air circulating between them. The amoun= t of water in the air would change the capacitance. Then I started thinkin= g about the fact that temperature would affect the density of the gases in = the air. Would that affect the amount of moisture per volume of air ? The= n my brain exploded. > > Gus in Denver --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .