A self-sustaining reaction is exactly what happens with the fissionable material inside the nuclear weapon[0]. It seems like you’re trying to be pedantic on ter

A self-sustaining reaction is exactly what happens with the fissionable material inside the nuclear weapon[0]. It seems like you’re trying to be pedantic on terminology here, but if you’re saying that a self-sustaining reaction is as un-scientific as a perpetual motion machine, you’re simply incorrect. [0] https://en.wikipedia.org/wiki/Criticality_(status) https://en.wikipedia.org/wiki/Criticality_(status)