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

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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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