The Transpiration reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Transpiration

Transpiration is a continuous process caused by the evaporation of water from leaves of plants and its corresponding uptake from roots in the soil. Transpiration cools plants down and enables mass flow of minerals to where it is needed in the plant. Mass flow is caused by the decrease in hydrostatic (water) pressure in the upper parts of the plants due to the diffusion of water out of stomata in to the atmosphere. Water is absorbed at the roots by osmosis, and any dissolved solutes travel with it in the xylem.

The amount of water lost by a plant depends on is size the temperature, the humidity and whether it is windy. But a fully grown tree will lose several hundred gallons (a few m³) of water through it's leaves on a hot dry day.

See also

• Evapotranspiration
• Transpirational pull
• Measuring transpiration with a Potometer

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Transpiration ist also the excessive production auf sweat in human beeings with many problems of its own, see Hyperhydrosis, Bromhidrosis/Bromidrosis (Bromadrosis).

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