How to Make a Tornado in a Bottle

It’s an experiment time! We have connected two bottles with a tube (we got it from here geni.us/tornado) but you can just connect them with a tape, just make sure you put a metal washer between bottles to make the hole smaller. Spinning the top bottle in a circular motion creates a water vortex that looks like a tornado. They say that you can colour water, add dish soap, glitter or lamp oil to make this experiment more impressive, but I find that using clear water works the best.
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