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Engine : Engineering Safety - 1079/968
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The upper explosive limit (UEL) of a mixture of flammable vapors and air is defined as __________.
A) that concentration above which there is just enough flammable vapor to produce an explosion
B) that concentration above which the mixture is too rich to burn
C) the percentage of flammable vapor by volume in air sufficient to create an explosion
D) the percentage of oxygen present in the air sufficient to support combustion
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