Tuesday, 3 January 2012

How to make an egg float in water

G is always asking to do science experiments - most of her ideas though are rather impractical ... so I thought this would be a good but simple experiment with things we had in the house.  First we put an egg into water - it sank! We discussed why this was. Then I suggested adding some magic powder. The girls took it in turns to add tablespoons at a time. Suddenly E called it "It is floating" - magic! We then had a look on line for a simple explanation (salt increases the density of water).
Later this led to further exploration in the bath of things that floated and sank - although I didn't let G test how much salt it would take before E floated!
This was good for counting, measuring and using the vocabulary float and sink.

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