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It all depends on the gas and concentration, and of course, the safety factor. Obviously any gaseous anesthesia will do it. Many organic solvents will do it to some extent. Of interest would be nitrous oxide (laughing gas) or various ethers. Too much carbon dioxide or carbon monoxide will do it, each with different consequences. And, of course, anything that displaces oxygen can knock you out.

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14y ago
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13y ago

Anesthesia...

It cuts the cross of nerves of pain being sent to the brain basicly shuts your whole system down or in this case sleep.

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Q: What gases knock people unconscious?
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