Question

give one word for: substances/gases that make one feel no pain​

Answer 1

Answer:

For example, nitrogen dioxide is brown-y orange, chlorine has a yellowish green hue and iodine vapour is a vivid purple (see image above). Other gases in the atmosphere (particularly oxygen, carbon dioxide and water vapour) also absorb light, but at ultraviolet and infrared wavelengths that we can't see.

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Answer 2

Answer:

nitrogen, oxygen, carbon dioxide, carbon monoxide, hydrogen, ozone, water vapour, helium, neon, argon