Gas Under Pressure
Gases under pressure chemicals are those that are placed on the market in cylinders under pressure. There are four main types, compressed gas ( e.g. nitrogen, helium), liquefied gas ( e.g. propane, carbon dioxide), refrigerated liquefied gas ( e.g. nitrogen) and dissolved gas. (e.g. acetylene)
They may explode if heated and for the refrigerated liquefied gas may also cause cryogenic burns. Great care should be taken in the use, storage and handling of these cylinders. It is very important that you read the label carefully before use.