Question:
Evapotranspiration is typically expressed in which one of the following units?
Evapotranspiration is typically expressed in which one of the following units?
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Evapotranspiration is the combined loss of water from the soil surface by evaporation and from plants by transpiration. Like rainfall, it is treated as a depth of water spread over an area.
Updated On: Jun 16, 2026
- \(\text{mm}^3\)
- mm
- kg mass per second
- \(\text{mm}^2\)
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The Correct Option is B
Solution and Explanation
Concept:
Evapotranspiration is the combined loss of water from the soil surface by evaporation and from plants by transpiration. Like rainfall, it is treated as a depth of water spread over an area.
Step 1:
Because it represents a depth of water lost over a given time (for example per day), it is expressed as a length unit, the same way rainfall is measured.
Step 2:
The standard unit is millimetres (mm), often quoted as mm per day. Units like \(\text{mm}^2\), \(\text{mm}^3\) or kg per second do not represent a depth of water and are not used.
Answer: Option (2) — mm.
Evapotranspiration is the combined loss of water from the soil surface by evaporation and from plants by transpiration. Like rainfall, it is treated as a depth of water spread over an area.
Step 1:
Because it represents a depth of water lost over a given time (for example per day), it is expressed as a length unit, the same way rainfall is measured.
Step 2:
The standard unit is millimetres (mm), often quoted as mm per day. Units like \(\text{mm}^2\), \(\text{mm}^3\) or kg per second do not represent a depth of water and are not used.
Answer: Option (2) — mm.
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