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Capilllary action

Capilllary action - Physics Forum

Capilllary action - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 12-05-2005, 12:16 PM
nick
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Default Capilllary action



Using capillary action will water rise against the gravitational
forces if so how high will it rise. any comments about this are
appreciated
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  #2  
Old 12-05-2005, 01:09 PM
N:dlzc D:aol T:com \(dlzc\)
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Default Capilllary action

Dear nick:

"nick" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ]...

Capillary action uses the meniscus, the surface tension of water
and its affinity for certain materials, to pull a "vacuum" of
sorts. The hardest vacuum at the surface of the Earth (not when
a hurricane is occuring) will lift water about 32 feet. Trees
manage to do this in stages, drawing water and nutrients up a few
hundred feet.

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.... down to "hydraulic-limitation hypothesis"

David A. Smith


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  #3  
Old 12-08-2005, 10:01 AM
H. Dziardziel
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Default Capilllary action

On Mon, 5 Dec 2005 06:09:22 -0700, "N:dlzc D:aol T:com \(dlzc\)"
<N: dlzc1 D:cox T:[Only registered users see links. ]> wrote:

[Only registered users see links. ]
How Trees Lift Water
2>The cohesion theory
According to this theory, water is actually lifted up trees from
above, using the power of the sun; it is pulled up under tension
as the sun evaporates water from the leaves. When first suggested
in 1894 this theory was greeted by disbelief, but since then a
large amount of evidence has been found to support it. For a
start, it has been shown that if water is held in a narrow pipe it
can actually withstand large stretching forces without breaking,
just like an elastic band. The water's strength is due to the
cohesion between its molecules. Experiments have shown that the
cohesive strength of water can hold up a column of fluid nearly
three kilometres high.

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