How does rain is measured in centimetres ?
In: Earth Science
The same way as inches, but shorter.
Seriously though, just stick a cylindrical container outside and measure the water level after a given time. They often have a funnel at the top to prevent evaporation.
Rain is measured in centimetres per square meter. They put out a collection vessel with markings that would correspond with enough water to fill 1cm in a square meter container and measure.
If you measure the volume of rain (measured in cubic centimeters) that falls over a given area (measured in square centimeters), you get a result in cm^3 / cm^2 . Simplify your units, you get centimeters.
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