If the quantity of matter of antimatter was switched, would it change anything?


Not really. If we were made of antimatter, we would think of matter as antimatter. Antimatter is really the same as matter, just with an opposite charge and opposite lepton/baryon numbers. The laws of physics would be virtually the same. However, if we were made of matter in a universe that was mostly antimatter, we'd have to be very careful not to get annihilated.

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  • $\begingroup$ thanks, but there probably would not be antimatter floating around... $\endgroup$ – nelomad Jun 20 '16 at 23:34
  • $\begingroup$ "The laws of physics would be the same and everything. "... and you know this because of which evidence? :-) $\endgroup$ – CuriousOne Jun 20 '16 at 23:39
  • $\begingroup$ "the laws of physics for antiparticles are almost identical to those for particles; any difference is a tiny effect" - scientificamerican.com/article/what-is-antimatter-2002-01-24 was one source I've read this at $\endgroup$ – heather Jun 20 '16 at 23:50
  • $\begingroup$ "Almost the same" is not the same and "a tiny effect" is not no effect. This is precisely why this question is such a fascinating one. The SciAm article condescendingly refuses to address it: "Recently both the NA48 experiment at CERN and the KTeV experiment at Fermilab have directly measured this asymmetry with enough precision to establish it." — never saying what the asymmetry is. $\endgroup$ – Martin Kochanski Jun 21 '16 at 0:25

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