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A United States of America penny has a radius of 9.525mm, and a thickness of 1.55mm.
The volume of a penny is given by pi * 9.5252 * 1.55 = 441.8 mm3
Assuming we melted the pennies down so that no space was wasted, the volume of the box needed to hold them all would be
441.8 * 7 000 000 000 000 000 000 000 = 3.093 x 1024 mm 3
Or, to put it another way, if the box was a cube, each side of the box would have to be about 90 miles long.
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