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Cake day: October 18th, 2023

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  • Liquid Hydrogen:

    2.6 kWh/L Volumetric Energy Density

    39 kWh/kg Gravimetric Energy Density

    Lithium Ion:

    0.693 kWh/L Volumetric Energy Density

    0.340 kWh/kg Gravimetric Energy Density

    Conclusion:

    Liquid Hydrogen is 3.75x more energy dense by volume.

    Liquid Hydrogen is 114.7x more energy dense by weight.

    Gravimetric energy density cannot be understated, weight is immensely important for aircraft. Planes can easily be grown to increase fuel storage as long as weight is kept low (hence why blimps are a thing). Weight is directed related to buoyancy.

    The only real barrier is cost of fuel. Airbus as well as other manufactures are working on Hydrogen planes with electric motors, so yes Hydrogen planes are still electric.