Lighter than Air
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Fact of the Day
Minus the equipment bringing people up and down, the Eiffel Tower weighs about 7300 tons. Due to its wide base, the imaginary cylinder place around the structure would have a lot more volume than the thin skeleton of the tower. [source]
On a smaller scale, a football can be used to test the weight of air. An inflated football weighs more than an inflated one. Mythbusters did an experiment showing that a helium filled football weighs less than an inflated one due to the opposing forces of helium and gravity.
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