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| | USATODAY.com (Site not responding. Last check: 2007-11-07) |
 | | To see why humid air is less dense than dry air, we need to turn to one of the laws of nature the Italian physicist Amadeo Avogadro discovered in the early 1800s. |
 | | In simple terms, he found that a fixed volume of gas, say one cubic meter, at the same temperature and pressure, would always have the same number of molecules no matter what gas is in the container. |
 | | More dense, or "heavier" air will slow down objects moving through it more because the object has to, in effect, shove aside more or heavier molecules. |
| www.usatoday.com /weather/wdensity.htm (1421 words) |
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