How Trees Get Water To Their Top Leaves

How Trees Get Water To Their Top Leaves

Ever wondered how a tree can get water tens of metres up to it’s top leaves? Well here’s the answer!

“Trees create immense negative pressures of 10’s of atmospheres by evaporating water from nanoscale pores, sucking water up 100m in a state where it should be boiling but can’t, because the perfect xylem tubes contain no air bubbles, just so that most of it can evaporate in the process of absorbing a couple molecules of carbon dioxide. Now I didn’t mention the cohesion of water (that it sticks to itself well) but this is implicit in the description of negative pressure, strong surface tension etc”.


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