Poseidon's Magic (page 8) Archimedes and Poseidon's Magic

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Poseidon’s Magic
Poseidon was the Greek god of the sea and the rivers.
As the rivers flow over the land things like salt dissolve in them.  The salt is carried into the ocean. When the ocean water evaporates the salt is left behind.
Materials: cup, grape, water, salt, spoon
STEP ONE:  Fill cup with water, drop grape into cup

What happened?

STEP TWO: Add salt to the cup, stir

What happened?



What’s Up? Archimedes’ Principle says that if an object weighs more than its volume in water it will sink.  Adding salt to the water will increase the mass until the water is more dense than the grape, so it floats.                
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