bottled gas

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Gas supplied under pressure in metal cylinders. The term includes pressurized gas (e.g. oxygen and nitrogen cylinders) and gases liquefied under pressure (e.g. liquid butane for use as a fuel). Colour conventions are used to identify the type of gas or, in some cases, the specific gas. The colour indicating the contents is that of the shoulder of the cylinder at the top. The convention is not international, and practice differs in different countries. In the UK, the convention is:

Yellow for toxic or corrosive gases

Red for flammable gases

Light blue for oxidizing gases

Maroon for acetylene

Dark green for argon

Grey for carbon dioxide

Brown for helium

Blue for nitrous oxide

Black for nitrogen

White for oxygen

http://www.airproducts.co.uk/cylindergases/coding.htm Information on colour coding of gas containers

Subjects: Chemistry.

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