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Amazing detergent

Amazing detergent

Follow these instructions to do an activity with colourful milk and learn about surface tension
To do this activity you will need

a saucer milk food colouring (four different colours) detergent.

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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