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Energy density. Uranium is ~20 grams per cm³. So a 1 tonne cube of uranium would be 37 cm (1×10⁶ grams / 20 g cm⁻³) ** (1/3): a little over 1 cubic foot contains the same energy as 3 million tonnes of oil. That's mind blowing, and energy dense. From "Beyond the energy crisis", J. Maddox 1975