2.55 Rate of transpiration

• Transpiration is the loss of water through a leaf.  
• Absorption of sunlight through the leaf transforms water into heat. 
• For evaporation to happen the liquid has to turn into a gas through diffusion through the stomatal pore.
• The concentration gradient for water if there is a big difference there would be a high rate of transpiration. 
• If the humidity was low that would make the rate of transpiration slow, with high temperature you would get more evaporation.