Question

what is an antimatter?​

Answer 1

material composed of the antiparticles of the corresponding particles of ordinary matter. ... For example, a positron and an antiproton can form an antihydrogen atom

Answer 2

Answer:

Antimatter refers to sub-atomic particles that have properties opposite normal sub-atomic particles.  Antimatter is the opposite of normal matter.

In modern physics, antimatter is defined as matter which is composed of the antiparticles (or "partners") of the corresponding particles of 'ordinary' matter.

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