Negative mass

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Notion

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Science and technology

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What Wikipedia says

In theoretical physics, negative mass is a hypothetical type of exotic matter whose mass is of opposite sign to the mass of normal matter, e.g. −1 kg. Such matter would violate one or more energy conditions and exhibit strange properties such as the oppositely oriented acceleration for an applied force orientation.

Excerpt from the Wikipedia article “Negative mass”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: IceGaze, CC BY-SA 4.0, via Wikimedia Commons.