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(can't edit first comment, sorry)

1kg of mass to energy (assuming every single particle met a corresponding antiparticle) would release a little over half the energy of the Krakatoa volcano eruption, similar to a 21 megaton bomb, so around the upper end of fusion bombs. Helium is about 99.5% the mass of the hydrogen that goes into it, so I guess those big fusion bombs must produce about 200kg of helium?

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wow interesting, when you say "upper end" it means the effeciency of matter → energy conversion is at the upper end of fusion, or 1kg of anti-matter would have the same power of an upper end fusion?

either way super cool

I meant that 21 megatons is big enough to be among what the USA and USSR would have called their biggest H-bombs.

(megaton, to be clear, is not a measure of mass when talking about bombs, it's a measure of energy released - a 1 megaton bomb is equivalent to the energy released by a million tons of TNT, if such a volume could be detonated)

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