In physics, are anti particles the same as anti matter or not?

Question

If not, then could someone please explain simply what both are?

Answer 1

is a particle matter?

Answer 2

Yes.  An antiparticle is a particle of antimatter in exactly the same way that a normal particle is a particle of matter.

Answer 3

Yes. All matter is made of particles. So anti-matter would have to be made of anti-particles

Answer 4

I see the confusion you may have with this question. The simple answer to this question is that they are one in the same. How ever antimatter has a connotation toward fully formed anti protons or even anti neutrons. The words particle and matter have been tested time and time again to see what is the smallest, how is it formed, and what make its qualities. The smallest particle now known is a quark (not including string theory). Quarks all have charge and a characteristic of angular momentum called spin. There are two main quarks that make up ordinary matter, they are the up and down quarks. Up quarks have a +2/3 charge, down quarks have a -1/3 charge. Both types have a 1/2 spin. So a proton is 2 ups and 1 down.  Now when we talk of antimatter things become interesting because their characteristic of angular momentum called spin is -1/2 and they have the opposite charge of their component quark. Ex: Anti Up has a -2/3 charge.

HERE: Is where I will point out the weird part of your question. Protons and Neutrons are not the only particles formed by these quarks. There are other smaller particles called mesons, which exist for only a fleeting moment in time. A meson is unusual because it contains a one quark of regular matter, and one of antimatter. So would this particle be considered anti matter or matter? The definitions we set out before us are often manipulated and changed many times over the course of history the smallest particle known has been changed over and over. The truth is it would not be that surprising if the smallest particle known is to be changed to something else 50 years from now, or even 100 years from now.

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