In theory, antimatter could be used as an extremely concentrated form of fuel, to run power plants, to propel rockets, or anything else that requires fuel. However, it is extremely difficult to store, requiring special magnetic containment since any contact with matter causes a big explosion. Unless some efficient solution is found for the storage problem, I doubt that antimatter will ever be used for much other than research into subatomic physics.
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antimatter and matter can be combined to form pure energy- 9^16 times its mass in joules of energy. Also if you consider hydrogen bombs advantages i guess that's one too, but antimatter is way too impractical- it costs billions per gram or something.
Antimatter is composed of antiparticles in the same way that normal matter is composed of particles. Consider that atoms are composed of protons, neutrons and electrons. An antimatter atom could be composed of anti-protons, anti-neutrons and anti-electrons (which we know as positrons).
An antihydrogen is an atom of the antimatter equivalent of hydrogen, or the antimatter equivalent of hydrogen as a collective.
The founder of antimatter is considered to be the physicist called Paul Dirac in 1928-1930. He created a mathematical equation which predicted the existence of antiworld made out of antimatter.
Initially the 9g of remaining matter would survive. Each particle of antimatter can only annihilate with one other particle of antimatter. At this point the 1g of antimatter would cause an explosion equivalent to that of 200000 pounds of TNT. Causing both groups of matter and antimatter to be obliterated.
Using E=mc2 2g of antimatter will yield the equivelent of 42.962 kilotons of TNT.