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Three balls. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

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Take three balls of the same size. One pick up steel, from a ball bearing. Another blind from paraffin (it is sold in a pharmacy) or from stearin from a candle. Cut the third out of cork, styrofoam, elderberry pulp, or another lightweight material. Wash a jar of mayonnaise or mustard and pour water into it about half way. Put all three balls in there. What will become of them?

three balls

It is clear that the steel ball will sink, fall to the bottom: steel is heavier than water. And paraffin and cork will float.

Share a jar of kerosene (gasoline). (Now you understand why I advise you to take a jar, not a glass. You can throw away the jar later, and you will not be praised for pouring kerosene into a glass!) Kerosene is lighter than water and will sit on top. The interface will be clearly visible. And on this surface there will be a ball of paraffin. The lower part of it will be in water, the upper part in kerosene. Why doesn't the paraffin ball float to the very top?

Because paraffin, although lighter than water, is heavier than kerosene. But the cork ball floats in kerosene. So now three balls will occupy three different "floors".

Author: Galpershtein L.Ya.

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