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For reference, 400 kg of Uranium amounts to 21 liters, or a little over 5 gallons

Or 80 liters in the form of UF₆ (which it probably is). About half of an oil barrel. You wouldn't put it all in a single barrel of course: that would explode.

Pedantically, it would melt.

If it's in a solid metallic form.

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