Marvin & Milo

Bottled tornado


Bottled tornado


What you need:

Two large plastic bottles

A washer


Duct tape

Food colouring



Fill one bottle two-thirds full with coloured water Turn the other upside down, put a washer between them and tape the joint firmly.

Turn them upside down, let the water flow normally, then swirl the bottles around vigorously.


Results & explanation

When you swirl the water, it forms a vortex like a tornado and flows much faster into the lower bottle.

Air from the lower bottle rushes to the top through a hole in the middle of the vortex as the fast-flowing water drains rapidly at the edges.

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