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  • Hydrogen Conversion Factors
    Pressure
    1 bar = 0.1 megaPascal (MPa) = 14.5 lbf/square inch (PSI)
    5,000 psi = 345 bars = 34.5 MPa
    10,000 psi = 689 bar = 68.9 MPa


    Volume
    1 standard cubic foot = 28.3 liters
    [standard conditions are atmospheric pressure and 60°F (16°C)]


    Mass
    1 kilogram = 2.2 pounds


    Energy
    1 British thermal unit (Btu) = 1,055.05585262 joules (J)
    1 calorie (cal) = 4.1868 joules (J)
    1 kilowatthour (kWh) = 3.6 megajoules(MJ)
    Temperature
    °C = (°F-32) x 5/9

    Source: US Dept of Energy