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空气中易燃易爆物质主要是指空气中存在的可燃气体和易燃液体蒸气(简称为可燃气体)。可燃气体与空气混合时遇火源可发生燃爆的最低浓度称为爆炸下限(LEL),用容积百分数(V%)或每立方米中的毫克数表示(mg/m3)。最高浓度称为爆炸上限。上、下限之间的爆炸浓度称为爆炸范围。空气中
Flammable substances in the air mainly refers to the existence of flammable gas in the air and flammable liquid vapor (referred to as flammable gas). The minimum concentration at which a combustible gas may combust when exposed to a source of air, is called the lower explosive limit (LEL) expressed in vol% (V%) or milligrams per cubic meter (mg / m3). The highest concentration is called the upper limit of explosion. The explosion concentration between the upper and lower limits is called the explosion range. in the air