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Question: How does a tree pass water round itself without the use of a pump? :)
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anon answered on 20 Mar 2014:
Think of the stem of a plant, or even the trunk of a tree like a very very long straw.
When you suck on a straw you create a pressure difference, because water sticks to itself (like in water droplets) the water moves up the straw. This process is called mass flow
In the many leaves of a plant, processes take place which remove water and create this pressure difference, and this is enough of a differnce to pull the water a very long distance indeed!
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