Tornado Tube Connector for Plastic Bottles
thingiverse
This gadget lets you link two water bottles together, then when you flip it upside down and spin it, you can create a whirlpool as the water flows from one bottle into the other! It's a fantastic way to demonstrate the strength of something invisible - air - since it disrupts the flow of water. The water will trickle slowly at first until you give it that crucial spin, pushing the heavier water towards the sides of the flask and creating a tube for air to shoot straight up through the center.
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