An H-bomb is a fusion weapon. Atoms are combined to make bigger atoms
This is as opposed to a fission bomb, which works by splitting very large atoms into smaller atoms.
The part that is probably really confusing about this is that every fusion bomb also has a fission bomb built into it.
The only place we know of where fusion occurs naturally is at the center of a star where the high temperatures and pressures needed for fusion to occur are present.
The only way we know of to reproduce those conditions outside of a star is the brief moment of time after a fission bomb explodes.
So to create a fusion bomb, you take a fission bomb and pack the fusion bomb material right next to it, such that right after the fission reaction goes off, the conditions will be just right to kick off the fusion reaction in the fusion part of the bomb.
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