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Natural uranium, a heavy metal, is not explosive. It is, however, quite reactive chemically. As a fine powder, if it is was thrown into the air, it would spontaneously begin burning as it is pyphoric. (As an aside, it's a very toxic heavy metal.) No amount of uranium will just "blow up" like the detonation of a brick of plastique (plastic explosive). But there is a bit more to know.

If uranium is enriched to increase its U-235 concentration, it can be come explosive if critical mass is reached and "maintained" for a very short duration via explosives. This is the basis for the operation of a nuclear weapon. Note, however, that under normal circumstances, any assemblage of uranium to critical mass (for that concentration of isotopes and the physical conditions) will cause fission to begin. The fission will release enough energy to immediately force the critical mass apart and stop the reaction, though the "mess" resulting will be highly radioactive one. These so-called criticality accidents have occurred from time to time, and they are uniformly tragic (and almost always fatal).

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