3 ms·
Capillary action is subject to the same limits as suction at the top. Capillary action can't increase the water pressure at the bottom of the tree. If you put
by leni536 3mo ago
Capillary action is subject to the same limits as suction at the top. Capillary action can't increase the water pressure at the bottom of the tree.
If you put a straight thin capillary tube upright in water so it sucks up water from the bottom, no matter how thin, it can't draw water up above ~10m of water level.
- rolph 3mo agoyou have an incorrect model, transpiration is capillary action and evaporation from mesenchyme xylem is not a straw, is no where near the diameter of a straw, and its[transpiration] is not about increased pressure its about decrease. psi values at the apical mesenchyme are around -100 to -150 megapascals dependent on species and relative humidity at the stoma. physics and biology although intertrined are not the same catechisms, heres a link toward most of m.j. canny's work. https://www.researchgate.net/scientific-contributions/M-J-Canny-5028675 https://www.researchgate.net/scientific-contributions/M-J-Ca... here is is a basic scheme of things Water Movement in Xylem: https://oercommons.org/courseware/lesson/87595/student-old/?task=4 https://oercommons.org/courseware/lesson/87595/student-old/?... Xylem: https://en.wikipedia.org/wiki/Xylem https://en.wikipedia.org/wiki/Xylem Hydrogen bond: https://en.wikipedia.org/wiki/Hydrogen_bond https://en.wikipedia.org/wiki/Hydrogen_bond