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Gary Miller

A wave is an energy package traveling across the water. Where did the energy originate?
Water is heaver than air. Why is dry air heavier than wet air?

Joe Concienne

IHOG: the energy usually comes from the wind. As wind blows across the water surface it start to rough it up and starts waves. How big the waves get depends on how hard , how long and the distance over which it blows. Another less frequent cause of big waves are underwater earthquakes.

Good question, wet air seems heavier than dry air but it is not. Remember air is mostly nitrogen the molecular weight of dry air is about 29 lbs per lb-mole. The molecular weight of water vapor is 18 lbs. per lb-mole. Thus a mixture of water vapor and dry air is lighter than pure dry air at the same temperature and pressure.

My guess is that we equate wet air with fog or misty conditions.However fog is a mixture of liquid and vapor and liquid water is much more dense than water vapor. Thus fog feels heavier than wet air which is all vapor.

Thanks for commenting
Joe

ole dad

the internet is great

http://www.theweatherprediction.com/habyhints/260/


George Croix

Another interesting article.
If only you'd go to DC and give those characters up there lessons on saying things in a factual, comprehensible manner...[wink]

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