One other thing that effects density is the barometric pressure. When I was taking flight training we used to have to calculate density for every flight. There is a formula for density altitude that pilots use to determine the performance of the aircraft. You need the altitude, barometric pressure, dew point and outside temp.

See this wiki article http://en.wikipedia.org/wiki/Density_altitude


Here is a calculator http://wahiduddin.net/calc/calc_da.htm

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