Upper Explosive Limit (UEL) definition
Upper Explosive Limit (UEL) means the maximum concentration of a vapour in air (or other oxidant) above which propagation of flame does not occur on contact with an ignition source and such limit is usually expressed as a volume percentage of vapours in air;
Upper Explosive Limit (UEL) means the maximum concentration of gas that shall be present in air for an explosion is to occur;
Upper Explosive Limit (UEL) means the maximum concentration of flammable vapor in air above which propagation of flame does not occur on contact with a source of ignition.