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Tree sap question
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27-02-2008, 06:43 PM posted to uk.rec.gardening
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Tree sap question
On 27 Feb 2008 17:06:46 GMT,
(Nick Maclaren) wrote
and included this (or some of this):
In article ,
®óñ© © ²°¹°-°² writes:
|
| 'Tain't so. Sounds plausible, until you think about it. If that
| were so, how would the sap reach the top of a 50' tree? Even a
| vacuum will raise water only 30'.
|
| Then try Osmosis. It's very powerful, and not limited to 30'
|
|
http://en.wikipedia.org/wiki/Osmosis
An old and good physical rule is that, if your explanation allows
you to construct a perpetual motion machine, your explanation is
wrong.
Osmosis still requires energy to drive it.
Osmosis is not perpetual motion. The attractant is fuelled by our
beneficent sun.
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