<sod>Plants regulate the rate of transpiration by controlling the size of the stomatal apertures. The rate of transpiration is also influenced by the evaporative demand of the atmosphere surrounding the leaf such as boundary layer conductance, [[humidity]], [[temperature]], wind and incident sunlight. [[Soil]] water supply and soil temperature can influence stomatal opening, and thus transpiration rate. The amount of water lost by a plant also depends on its size and the amount of water absorbed at the roots. Transpiration accounts for most of the water loss by a plant by the leaves and young stems.  Transpiration serves to evaporatively cool plants, as the evaporating water carries away heat energy due to its large [[Latent heat|latent heat of vaporization]] of 2260 kJ per litre.<eod>
<sod>Plants regulate the rate of transpiration by controlling the size of the stomatal apertures. The rate of transpiration is also influenced by the evaporative demand of the atmosphere surrounding the leaf such as boundary layer conductance, [[humidity]], [[temperature]], wind and incident sunlight. [[Soil]] water supply and soil temperature can influence stomatal opening, and thus transpiration rate. The amount of water lost by a plant also depends on its size and the amount of water absorbed at the roots. Transpiration accounts for most of the water loss by a plant by the leaves and young stems.  Transpiration serves to evaporatively cool plants, as the evaporating water carries away heat energy due to its large [[Latent heat|latent heat of vaporization]] of 2260&nbsp;kJ per litre.<eod>