Why does rain gauge have a small opening
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Answer:
The more information people have about the weather, the better. Sure, it helps when your local meteorologist reminds you that you might need an umbrella one day. But tracking weather isn’t just about keeping you dry on your way to school. It’s also an important way to help farmers grow crops that will sustain billions of people and recognize weather patterns in order to better prevent and prepare for weather-related natural disasters. The rain gauge is one of the easiest tools for everyone from meteorologists to farmers to use to measure precipitation.
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The inner tube's diameter is just small enough to make the depth of rain ten times what it would be in a gauge without the tube and funnel. Thus, each inch in the tube is equivalent to 0.1 inches (a tenth of an inch) of rainfall. This makes it easier to read accurately.