2.54 Transpiration

+ Evaporation of water (liquid -> gas) needs heat. This heat is produced by sunlight as absorbed by leaf structure through the stomatle pores.
+ water goes up the the roots, up the plant structure to the leaf, this is where eveaporation happens.
+ Looking at a cross section of the leaf: not all light is absorbed by the chloroplasts some generates heat.
+ Just above the stomatle pores, phase change occurs (liquid -> gas) = evaporation
+ water vapor gas diffuses down through pore, which has a steep diffusion gradient.