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26th July 2008, 05:31 AM
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Amazing detergent
What you need
To do this experiment you will need 1.a saucer 2.milk 3.food colouring (four different colours) 4.detergent. What to do 1.Fill the saucer with milk. 2.Add one drop of each food colour to the milk around the edge of the saucer. 3.Add one drop of detergent into the centre of the saucer. What's happening The colours swirl and zoom around the saucer. Milk stays together as one liquid because of surface tension. This acts like a skin and keeps the milk in a puddle. When you add the detergent, it breaks the surface tension of the milk in one spot. The pull of the surface tension from the milk at the edge of the saucer causes the milk in the centre to move to the outside, taking the colours along with it. The colours keep moving until the detergent stops affecting the milk. 
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