What Does Flammability Limit of Liquids Mean?
Flammability limits indicate the upper and lower parameters within which dispersed combustible material (fumes) mixed with air will burn. These limits vary depending on the combination of temperature and pressure, so these values are expressed as a volume percentage at a temperature of 77 F (25C) at atmospheric pressure. The intensity of combustion may vary from deflagration (burning) to explosion. These values are used to determine optimum conditions for combustion or to create conditions that prevent combustion.
Safeopedia Explains Flammability Limit of Liquids
Flammability limits of liquids can be expressed as a lower flammability or explosive limit (LFL or LEL) where the minimum mixture of dispersed combustible material can be ignited, and the upper flammability or explosive limit (UFL or LEL) in which the mixture becomes too saturated to be flammable. Flammable and combustible liquids present a fire hazard when vapor mixes with air. The liquid itself does not burn, but the mixture of vapors and air can result in very fast-burning, hot fires that often emit toxic smoke. As a result, flammable and combustible liquids should be handled, stored and used within predetermined safety parameters.