Why it is impossible to use fire and allow sparks to appear near empty containers where flammable substances

Why it is impossible to use fire and allow sparks to appear near empty containers where flammable substances (gasoline, ether, alcohol) were stored

Therefore, these substances are called flammable, since it is the vapors of these substances that ignite. And, even if the container is empty, vapors can remain there for a long time and can easily ignite from a spark, and an explosion can occur at a certain concentration.



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