OK, admit it! On a really windy day, you've noticed that the water in the toilet is moving. But, the plumbing is underground, so how can wind affect it? Every toilet has a vent pipe that goes outside. Without it, your toilet wouldn't flush. Most vent pipes go up and out the roof. When the wind blows really hard above the opening of the pipe, it creates rising air inside the pipe. Think of it as a suction. It's actually a tiny area of low pressure at the top of the pipe. Remember from previous lessons that low pressure involves rising air. So, the air tries to rise out of the pipe as a result of strong wind above it. That causes the water level in the toilet to drop slightly. As the gust subsides, the water level rises back to normal again. This continual ebb and flow of wind above the vent pipe makes the water in your toilet jostle. Watch the video with this story for more.
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