Margaret M. Loos
Materials
Water, vegetable oil, glycerin, alcohol, cork, hard rubber stopper, pieces of wooden splints, strips of aluminum and copper, 2 liter beaker.
Procedure
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1. Pour each of the liquids into the beaker slowly so layers are not too disturbed. Students may try to predict which will sink below the water and which will rise.
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2. Drop each of the solid objects into the liquids carefully. Will they all sink to the bottom?
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3. Write observations in notebook.
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4. Draw beaker, layers and objects.
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5. Let stand for a day and see if any of the layers changes.