Take an aluminum foil of 10 cm x 10 cm. Fold it from the boundaries to make a box of height 1 cm. Put it on the top of the water inside a bucket. How many marbles do you think you can add to this box? Take a guess before doing the experiment.
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The thickness of foil will probably be about a micrometer thick so for centimeters that means a thickness of 1 x 10-4 cm. Given that the size of an atom is about 10-10 m, the number of atoms in a 1 x 10-4 cm will be 1 x 104.
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