factors affecting transpiration

• Increase temperature = increase transpiration. The kinetic energy of water molecules increases so the evaporation rate increase.
• Increase in humidity = decrease transpiration. The water potential between the inside of the leaf and the air decreases.
• Increase in air movement = increase transpiration. Increase rate of evaporation because it removes the boundary layer so increased water potential gradient
• Increase in light intensity = increase transpiration.

  Increased photosynthesis rate = increased number of stomata open = increased surface area for water loss = increased rate of evaporation/transpiration