Racing Liquids - Art on a Plate

This video from the Royal Society of Chemistry (RSC), aimed at primary teachers, demonstrates an experiment which may be used when learning about liquids.

Milk is poured onto a plate and drops of food colouring dotted onto it. The colours hang in the liquid due to a mixture of surface tension and the properties of milk. A cotton bud dipped in washing up liquid is then dipped in the milk and the colours appear to race away from it. This happens because the detergent breaks the surface tension allowing the colour to move and mix together. The result is a colourful pattern or ‘art on a plate’.

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