Imagine that we could weigh antimatter on a scale. Would it have a negative or positive weight. EDIT: I see a similar question, but it dates from 2014. It mentions some experiments to be carried out. Any conclusive stuff?
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This is a big unanswered question in physics, and a great one at that! – TheEnvironmentalist Apr 18 '21 at 23:18
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2Related: Is it possible that antimatter has positive inertial mass but negative gravitational mass? ... Does antimatter curve spacetime in the opposite direction as matter? ... Why would Antimatter behave differently via Gravity? ... Has the gravitational interaction of antimatter ever been examined experimentally? – Chiral Anomaly Apr 18 '21 at 23:40
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Is the scale and the planet it is on made of matter or anti-matter? ;) – DKNguyen Apr 19 '21 at 06:00
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Well... do antimatter attract itself? – daniel sp Apr 20 '21 at 06:08
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This experiment has not yet been completed, but physicists at CERN are working on determining whether antimatter “falls” down or up under the influence of Earth’s gravity. The usual assumption is that it will fall down, just like ordinary matter. Finding otherwise would be a Nobel Prize-winning discovery, as it would be the first known violation of the Equivalence Principle, a foundation of Einstein’s General Relativity.
Falling down is equivalent to having positive weight.
G. Smith
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