On 2002-10-29 16:52, Anonymous wrote:
cold humid air is more dense than hot humid air.
Yes - but dry air is more dense than humid air !
The water molecules have lower atomic weight - 18, whereas air (2 Nitrogene and 2 Oxygene) are much heavier - 29.
So the more humid the air is (at the same pressure), the less dense it will be, and lift less.
But the difference is very small - only up to 2% in density, from 0 to 99% humidity in warm air.
Temperature and pressure changes means much more for the lift (density = lift).
Just for the record...