Create a simple whirlpool in a bottle and learn about the interaction of air pressure, water pressure, and gravity. A vortex is a spiral motion of fluid that sucks everything near it towards the center. These center pulling forces are made by a combination of air pressure, water pressure, and gravity. As the water starts to spin, it pushes out against the bottle and leaves a hole in the middle. The hole in the middle allows the air in the bottom bottle to travel upward. As the air comes up, the water can flow into the bottom bottle because there is now space for it to move.
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