Transpiration rate

• Light intensity

  • The brighter the light, the greater the transpiration rate
  • Stomata close in the dark so very little water can escape
• Temperature

  • The warmer the temperature, the faster transpiration happens
  • Water particles have more energy to evaporate and diffuse out of the stomata when it is warm
• Air flow

  • The better the air flow, the greater the transpiration rate
  • Water vapour is swept away in the wind, maintaining a low conc of water in the air outside the leaf meaning diffusion can happen quicker
• Transpiration rate experiment

  • Calculating the speed of the air bubble movement gives an estimate of the transpiration rate