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Need more info? In order to find out how much mass "weight" is in one liter of compressed hydrogen you need to know what pressure and temperature the hydrogen is at, basic thermodynamic. For example hydrogen at one ATM (atmosphere or pressure at sea level) and at room temp has a density of around .09 Kg/m3 and Liquid Hydrogen at one ATM (-423 deg F, cold enough to literally freeze air) has a density of 70 Kg/m3 , which differs by a factor of 777.

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13y ago

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