Ignitible Mixture 3 : A gas-air mixture that is capable of being ignited by an open flame, electric arc or spark or high temperature. See: Explosive Limits. (RP 14F)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}