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The cup that had no salt in it the egg sank. The one that had salt in floated because salted water is heavier.

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Put salt in one cup and water in the salt one, put water in the last one and you need to rember what one got salt in it

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One glass of plain water
One glass of water with  about a tablespoon of salt mixed in
Two eggs

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I  think it will  float in the salt water.

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Will the egg float or sink in the water?