Jun 17

shopping list
1. milk
2. food colouring
3. plate
4. washing up liquid
5. syringe

what we did (written by dylan)

Pour some milk on to a plate. Put a few drops of food colouring in the middle of the plate. Put some washing liquid in the syringe, then drop some washing up liquid into the middle all of the food colouring and watch it go. The name of this process is called Diffusion!

Science Explanation (written by dad)
The washing up liquid acts as a degreaser separating the fat molecules in the Milk. Because the Milk has a low surface tension the fat molecules can easily be split. As the molecules are split it causes a motion which creates the swirling of the colours.

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