Attention, Scientists! This water tornado experiment involves a lot of water, which can be easily spilt.  So make sure you do this experiment either outside, or over the kitchen sink, or over a tray/bucket to avoid making a watery mess at home! You will need:
  • Water bottle (2 litres)
  • Access to water
  • Fill the empty 2 litre bottle 1/3 of the way up with water.
  • Place your hand on top of the open bottle cap, then turn the bottle upside down.
  • With the bottle in your hands, perform a clockwise spin shake until you see the water spinning in the bottle.
  • After spinning for a few moments, remove your hand from the cap and let the water pour out.
  • Watch the water tornado spin.
The Science Bit: Have you ever noticed when you empty a bottle of water it takes a few seconds for the water to get out of the bottle? That’s because air is going into the bottle as the water leaves it.  Because there is only one cap it’s a small space for both the water to leave and the air to enter.  So a lot of bubbles appear as you tip the water out, causing it to slowly exit the bottle.  However when applying the spinning shake you are spinning the water inside the bottle which causes a little current for the water to exit with an equal amount of space for the air to come in.  Best of all it looks like a tornado as the water exits.

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