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After a bit more research Ive found an easier to understand way of explaing the density of humid air than molecular weights. In the atmosphere an area of low pressure contains more moisture and hence is less dense than an area of high pressure which is usually drier with less humidity.

[/b] That is a crazy idea but correct so Ive learnt something.Wikipedia confirms it but is still seems illogical until one considers the molecular weights of air and water.

I used to get excellent results with three gallons of water per acre through the CDA (Controlled Droplet Applicators) system with Round Up. I used the 250 micron size droplets which gave me no drift and good coverage although the 125 micron was reccomended for use with Round Up. As an additive I...

Where did you get the idea that humid air is less dense. Ive found the best time to put Treflan (Triflur) on is on a damp foggy morning allowing me to get the first stage of soil in corporation done before the sun get too strong.