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Solids density
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    Eraser piece.
    Toothpick piece.
    Cork piece.

    Ethyl alcohol.
Videos:  download.avi (110 KB)



     1. Use the glass with the liquids of the experiment: Liquids density.

     2. Add the solids, one by one, to the glass.

     3. You can verify that the wood and the cork will remain in the surface of the alcohol. The plastic will be in the surface of the olive-oil, and the eraser piece in the surface of the honey. (in the video the cork was added first, followed by plastic, toothpick and eraser)

There are solids less dense than liquids? All the solids remind a compact phase, where the arrangement of molecules is very ordered and well defined. With this in mind it is surprising that there exists solids less dense than liquids. If it wasn't like that, Vasco da Gama caravels wouldn't float in the oceans and, therefore, wouldn't reach India.

In this experiment, the wood and the cork float in ethyl alcohol, while plastic floats in olive-oil. Finally, the eraser floats in the honey surface. Each solid object sinks to the level of the liquid that has higher density than it's, that means, it will float in that surface. The results of this experiment proof that plastic density is between the one of alcohol and olive-oil. The wood and cork are less dense than all the used liquids. On the other hand, the eraser is denser than alcohol, olive-oil and water. The density of the eraser is between the density of the water and honey. To conclude, I can leave two interesting questions: "A grape will float in which liquid?", "And the peel of the orange, it will float in which surface?" Try it!

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