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I believe the answer is numbers
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six noble gases
Here are five of the six noble gases: helium, neon, argon, kypton and xeon. They're all colourless and transparent. Krypton and xeon form compounds only with difficulty. Helium, neon and argon don't form compounds at all.
A machine called a barometer is what is used to measure atmospheric pressure :D
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the answer is k? lol thanks