Propane is a liquid when under presure in the cylinder but vaporizes when released.Argon gas is used with the inert- gas welding processes. It's a completely inert-gas and is used in welding to provide a protective envelope around the welding zone.Argon is obtained from the atmosphere by liquefaction and distillation of air and is stored in standard oxygen cylinders under substantially the same pressures as oxyge
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