A further thought is not even nuclear fusion or fission converts all the mass into energy. Not even close. What is liberated in these processes is some of the nuclear binding energy - this is the strong nuclear force that is attracting* the nucleons together to form a nucleus of an atom. It is a fraction of the total mass of the nucleus. It is also not fixed as a ratio to the number of nucleons - the highest nuclear binding energy is for iron,** the lowest for hydrogen. Matter-antimatter collisions of mutual particle pairs can annihilate the constituents to pure energy, but these are pretty rare things (fortunately, or the universe would be basically empty of everything but liberated energy). Other than that, way of converting all mass into energy are extremely thin on the ground. And getting hold of that 1kg bag of anti-sugar*** is going to be difficult.
* - as this is an attractive force it is a negative energy - work has to be done against it to pull everything apart. Gravity is also attractive, so also regard a negative quantity in the same way. This is not just a handy conceptualisation to aid comprehension, but an actually measurable phenomenon; protons and neutrons each have an individual mass. But if you sum together the masses of all the protons and neutrons making up a particular atom, and then weigh the atom to confirm your sums are right, then the atom always comes out underweight. This is the negative nuclear binding energy manifesting itself as a negative mass (E = m . c^2 again...).
** - that there is a maximum which is why supernovas happen (everything tends towards iron). Once you get to the maximum, you can't fuse that and get energy out - it takes energy in instead. If a star gets to the point of having iron as the fuel supply to fuse, it implodes.
*** - sugar formed of molecules whose atoms consist of positrons, antiprotons and antineutrons.
* - as this is an attractive force it is a negative energy - work has to be done against it to pull everything apart. Gravity is also attractive, so also regard a negative quantity in the same way. This is not just a handy conceptualisation to aid comprehension, but an actually measurable phenomenon; protons and neutrons each have an individual mass. But if you sum together the masses of all the protons and neutrons making up a particular atom, and then weigh the atom to confirm your sums are right, then the atom always comes out underweight. This is the negative nuclear binding energy manifesting itself as a negative mass (E = m . c^2 again...).
** - that there is a maximum which is why supernovas happen (everything tends towards iron). Once you get to the maximum, you can't fuse that and get energy out - it takes energy in instead. If a star gets to the point of having iron as the fuel supply to fuse, it implodes.
*** - sugar formed of molecules whose atoms consist of positrons, antiprotons and antineutrons.
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