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Dictionary error not noticed for 99 years http://www.x404.co.uk/forum/viewtopic.php?f=19&t=8193 |
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Author: | ProfessorF [ Tue May 11, 2010 7:02 pm ] | |||||||||
Post subject: | Dictionary error not noticed for 99 years | |||||||||
http://www.stuff.co.nz/world/australia/ ... r-99-years Say what you like about Wiki, but the fallacies don't usually hang around 99 years... |
Author: | JJW009 [ Tue May 11, 2010 10:07 pm ] |
Post subject: | Re: Dictionary error not noticed for 99 years |
Although gravity provides the driving force it's important to note that atmospheric pressure does play an important role. It is perfectly valid (but insufficient) to say that the air pressure is what pushes the water up. The maximum hight of water that can be lifted by a siphon or a top-drawn pump is entirely dependant on atmospheric pressure. This is about 32 feet at sea level. Above this lift, the column of water will break because there is insufficient pressure from below to support it. For a denser fluid such as mercury, the height is reduced proportionally. This is how a mercury column manometer works, and hence "inches of mercury" as a unit of pressure. |
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