NASA - Reading a Rain Gauge

NASA - Reading a Rain Gauge

Reading a rain gauge is simple. We can look at the measurement marks on the side of a rain-capturing device, and find the level of water collected from a passing storm. Depending on what system is used where we live, we can read inches or millimeters and say how much rain has fallen. But the device collects a volume of liquid, doesn’t it? Why do rain gauges measure rain in millimeters or inches, which are units of length, instead of in pints or liters, which are units of volume? (See full story for image gallery.)

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