User:Abigailctyrrell/sandbox

Transpiration:

If the water potential in the ambient air is lower than the water potential in the leaf airspace of the stomatal pore, water vapor will travel down the gradient and move from the leaf airspace to the atmosphere. This movement lowers the water potential in the leaf airspace and causes evaporation from the mesophyll cell wall menisci of liquid water. This evaporation increases the tension on the menisci surface and increases it's radius. Because of water's cohesive properties, the tension travels through the leaf cells to the leaf and stem xylem where a momentary negative pressure is created as water is pulled up the xylem from the roots.