What is the unit of measurement used in determining amount of evaporation?

Measuring Invisible Water Loss

Ever wonder how weather scientists figure out just how much water is vanishing into thin air each day? It is not just about tracking rain clouds; it also involves keeping a close eye on evaporation. To do this, meteorologists rely on a surprisingly straightforward approach using specialized containers known as evaporators.

When measuring daily evaporation—even when temperatures drop and the water surface freezes—experts track the actual depth of the water layer that disappears over a 24-hour period. Instead of dealing with complex volumes, the results are recorded in millimeters and are accurate down to 0.1 mm. This precision helps us better understand everything from local weather patterns to broader agricultural needs.