Question

What is Anti-Matter?​

Answer 1

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Antimatter is a material composed of so-called antiparticles. It is believed that every particle we know of has an antimatter companion that is virtually identical to itself, but with the opposite charge. But its antiparticle, called a positron, has the same mass but a positive charge.

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Answer 2

Antimatter refers to sub-atomic particles that have properties opposite normal sub-atomic particles. ... More specifically, the sub-atomic particles of antimatter have properties opposite those of normal matter. The electrical charge of those particles is reversed.