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Lighter Than Air: Why Do Balloons Float?
water and air (a liter of water weighs about 1,000 grams, while a liter of air weighs about 1 gram), it is still significant. Helium weighs 0.1785 grams per liter. Nitrogen weighs 1.2506 grams per liter. As nitrogen makes up about 80 percent of the air we breathe, 1.25 grams is a good approximation for the weight of a liter of air.
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