Flammability limits, also called flammable limits, give the proportion of combustible gases in a mixture, between which limits this mixture is flammable. Gas mixtures consisting of combustible, oxidizing, and inert gases are only flammable under certain conditions. The lower flammable limit (LFL) describes the leanest mixture that still sustains a flame, i.e. the mixture with the smallest fraction of combustible gas, while the upper flammable limit (UFL) gives the richest flammable mixture.
There is a quantitative difference between flammability limits and explosive limits. In an explosive mixture, the fuel oxidizer mixture is closer to stoichiometric proportion. This difference has no practical application in safety engineering as the flammable vapor cloud is turbulent and the exact mixture of fuel and oxidizer varies greatly. Therefore, many references use the term flammability limit (LFL, UFL) and explosive limit (LEL, UEL) interchangeably.
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Flammability limit - Wikipedia, the free encyclopedia
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Interesting is the point that the doors and windows of the compartment remained locked and the Kar Sevaks merrily burnt themselves in total glee and ecstasy!
And none jumped out to save themselves!