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1 liter of liquid hydrogen weighs only 0.07 kg. That is a density of 70.8 kg/m³ (at 20 K)
There are 3.7854 liters per gallon, so 1 gallon of liquid H2 weighs 0.268 kg.
There are 2.2046 lbs per kilogram, so 1 gallon of liquid H2 weighs 0.5908 lbs.
Compare that with the weight of 1 gallon of water: 8.3454 lbs (more than 14 times heavier!)

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∙ 19y ago

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