CREATE YOUR OWN VORTEX IN A BOTTLE WITH A CONNECTOR, TWO EMPTY PLASTIC BOTTLES, SOME DUCT TAPE AND WATER!
The bottles are connected but there is a hole between them. One of the bottles has water in it. There is air above this. Gravity makes the water go downwards when the bottles are tipped up.
When you tip without swirling, the air and water ‘fight’ to move through the gap, slowing down the passage of water. When a vortex is formed, the water swirls around the outside as it goes down, allowing the air to move through the middle.
It looks a bit like a small tornado – you’ve probably seen something similar in the plughole of a bath!
HEALTH AND SAFETY
Ensure any spillages are immediately cleared up. Encourage the children to just swirl the vortex, keeping their hands firmly around the join of the 2 bottles to prevent spillages.