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Asked by ClassHimid on 26 Apr 2024.
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Sarah Montgomery answered on 27 Jun 2024:
Yes, a number of gases are coloured, such as nitrogen dioxide which is brown and fluorine which is yellow (but quickly reacts with anything else around!). Oxygen is invisible under normal conditions but if you cool it down it eventually turns into a blue liquid which is pretty weird.
Comments
Andrew commented on :
Many gasses are coloured so they can be seen. E.g. bromine gas is a brown colour.
Steve P commented on :
Consider the air / atmosphere – would you say you can ‘see’ air? Consider a blue sky – what are you looking at? You are seeing the atmosphere (combination of gases), and it looks blue because that parts of the spectrum is scattered by air molecules more tha the other visible wavelengths of the visible spectrum. Welcome to the world of identifying a gas (or gases) from its interaction with light.