A gas that forms a flammable mixture with air at a concentration of 13 percent by volume or less, or forms a range of flammable mixtures with air that are wider than 12% by volume, regardless of lower flammable limit.
                                                            
                                                     
                        
                                                
                        
                        
                            A gas that, at ambient temperature and pressure, forms a flammable mixture with air at a concentration of 13 percent by volume or less; or a gas that, at ambient temperature and pressure, forms a range of flammable mixtures with air wider that 12 percent by volume, regardless of the lower limit.
                                                            
                                                     
                        
                                                
                        
                        
                            Gas that when mixed with air forms a flammable mixture at ambient temperature and pressure.
                                                            
                                                     
                        
                                                
                        
                        
                            A substance which meets the criteria for WHMIS Class B Division 1 flammable gas, (a compressed gas with an upper flammable limit of 13% or less or with an explosive range of 12% or more).
                                                            
                                                     
                        
                                                
                        
                        
                            Any compressed gas that will burn.