Transpiration

Transpiration is the evaporation of water from plants, especially leaves. It is a type of translocation and part of the water cycle. The amount of water lost by a plant depends on its size, the light intensity, temperature, humidity, wind speed, and soil water supply. The process of Transpiration helps in regulating temperature in the plant.

Transpiration was first worked out by Stephen Hales (17 September 1677 – 4 January 1761), an English clergyman.^[1][2] He proved what is still believed, that the evaporation of water molecules from leaves is the main force pulling the water column up from its origin in the roots.

1. ↑ Morton A.G. History of botanical science. New York: Academic Press, 248–251.
2. ↑ Hales, Stephen 1727. Vegetable Staticks. London: W & J Innys. [https://web.archive.org/web/20070210020305/http://www.illustratedgarden.org/mobot/rarebooks/title.asp?relation=QK711H341727 Archived 2007-02-10 at the Wayback Machine [1]]