Gasoline/air mixtures in which the gasoline vapors are held to less than 5% are considered safe.

Question

Quizplus · Accepted Answer

Gasoline/air mixtures with gasoline vapors less than the Lower Explosive Limit (LEL) of approximately 1.4% by volume in air are considered too lean to ignite, thus considered safe. Above this but below the Upper Explosive Limit (UEL) of about 7.6%, they can be explosive. Therefore, less than 5% is within the explosive range, not considered safe.

Gasoline/air Mixtures in Which the Gasoline Vapors Are Held to Less