About Antimatter:
In particle physics, antimatter is material composed of antiparticles; which have the same mass as particles of ordinary matter but have opposite charge and other particle properties such as lepton and baryon number, quantum spin, etc. Collisions between particles and antiparticles lead to the annihilation of both, giving rise to variable proportions of intense photons (gamma rays), neutrinos, and less massive particle–antiparticle pairs. The mass of any produced neutrinos is negligible, while they contain energy that generally continues to be unavailable after the release of particle–antiparticle annihilation. The total consequence of annihilation is a release of energy available for work, proportional to the total matter and antimatter mass, in accord with the mass–energy equivalence equation, E = mc2.