Definition(s)
Explosive Atmosphere
Mixture with air, under atmospheric conditions, of flammable substances in the form of gas, vapour, mist or dust, in which, after ignition, combustion spreads throughout the unconsumed mixture. [IEV 426-02-02, modified]
Source: IEC 61892-7, Mobile and fixed offshore units – Electrical installations – Part 7: Hazardous areas. Global Standards