We seem to have hit the limit with tests such as Tsar Bomba, but that is only because it’s not reasonable or necessary to push it any farther. But I’m wondering what the theoretical limit is. Is there a limit for a single device in which size would make an effective reaction impossible?
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There is no theoretical limit based on how many stages and boosters are used. But at a certain point it becomes worthless, as the fireball exits earth’s atmosphere and energy is lost into space. Reactions larger than this would have most of the energy completely lost to space, so that’s the practical maximum.
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