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The egg in the salt water floated because the salt water makes the water heavier. The one with no salt in it will sink because the water has nathing to hold itself.

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One glass of plain of water,
one glass of  of water with a tablespoon of salt mixed in and two eggs.

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First we filled the glasses with water and then we added a tablespoon of salt to one glass and stirred it to dissolve. We put an egg into each glass and watched what happened.

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I think the egg will sink into the water.

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Will the egg float ?

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We saw that the egg in the salt water did float.