aga ab acetylene air liquide airgas argon basf bottled gas breathing gas business carbon dioxide carbon monoxide ceramic chemical industry chemistry chlorine commerce cutting environmentalism fertilizer food processing glass helium hydrogen hydrogen chloride inerting system inorganic compound krypton liquid mapp gas manufacturing medicine metallurgy methane neon nitrogen nitrous oxide organic compound oxy-fuel welding and cutting oxygen pipeline transport praxair propane rail transport semiconductor semiconductor industry ship transport soda fountain solid steel sulfur dioxide the boc group the linde group water treatment welding xenon