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Gray Matters by Stuart Carlson and Jerry Resler for March 22, 2021
March 21, 2021
March 23, 2021
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By Archimedes Principle, a helium balloon floats upward because the weight of the balloon is less than the weight of the air it displaces. The volume of air displaced by a tanker truck remains constant regardless of whether it contains helium or a vacuum. Since helium weighs more than nothing, a truck filled with helium weighs more than a truck filled with nothing.
