What does an open pan evaporator measure?

✅Explanation:
-An open pan evaporator is used to measure evaporation from a water surface. It is a commonly used tool in meteorology and agriculture to estimate the amount of water lost due to evaporation from a given area.

📌Other Options Explanations:
-Evapotranspiration is a combination of both evaporation and transpiration (water loss from plants). However, an open pan evaporator specifically measures evaporation, not transpiration, which requires other instruments to measure the water loss through plants.

🛑 Additional Information::
Evaporation is a cooling process in which latent heat of vaporization must be provided by the water body. Vaporization rate increases due to faster winds but if the wind velocity is sufficient to remove all the vapor above the water surface, then any further increase in wind velocity will not affect the evaporation rate. Cetyl Alcohol is used to reduce the evaporation rate.
Evaporation is measured using an open pan. The most commonly used evaporation pan is Class A evaporation pan.
Class A evaporation pan is cylindrical in shape having 120.7 cm diameter and has a depth of 25 cm.
This pan rest on a carefully leveled, wooden base and is mostly enclosed by a metal fence to prevent animals drinking from it.
Important Points
Instrument for measurement of evapotranspiration → Iysimeter
Instrument for measurement of capillary potential → Tensiometer
Instrument for measurement of humidity → Hygrometer
Instrument for measurement of radiation from sun → Pyranometer
Instrument for measurement of wind velocity → Anemometer