Compressed gases and liquids are by their very nature hazardous. The materials contained within cylinders are under a great deal of pressure. The contents may also be flammable, toxic, corrosive or have other dangerous characteristics, creating a multiple hazard for responders.

More than 200 gases and liquids are routinely packaged and shipped in cylinders. Compressed gases like helium and carbon dioxide as well as more specialized gases such as acetylene and liquid nitrogen are transported in commercial vehicles, delivery trucks, pickups and passenger cars. This video gives the viewer a quick overview of specific properties associated with Class 2 materials and the reasons that they should be handled carefully.