- Evaporation: water turning into water vapour (liquid to gas)
- Transpirarion: evaporation from plant leaves
- Evapotranspiration: process of evaporation and transpiration together.
Potential evapotranspiration (PET) is the amount of water that could be lost by evapotranspiration. Actual evapotranspiration is what actually happens.
Example: in a desert, potential evapotranspiration is high because heat increases evaporation, but actual evapotranspiration is low because there isn't that much moisture in the first place.
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