Which term describes the temperature range between the lower and upper limits within which vapors will ignite?

Which term describes the temperature range between the lower and upper limits within which vapors will ignite?

• A. Fire Point
• B. Lower Explosive Limit
• C. Flammable-Explosive Range
• D. Upper Explosive Limit

Answer: (C)

The concept here is the range of vapor-air mixtures that can ignite. Vapors will ignite only if their concentration in air falls within a certain band—not too lean and not too rich. This entire band is known as the flammable-explosive range. It’s bounded on the lean side by the lower explosive limit (the minimum concentration needed for ignition) and on the rich side by the upper explosive limit (the maximum concentration that can still ignite). The fire point is about the temperature needed to keep a flame going, and the individual lower or upper explosive limits describe just one end of the range. So the term that best describes the whole range where ignition is possible is the flammable-explosive range.

The concept here is the range of vapor-air mixtures that can ignite. Vapors will ignite only if their concentration in air falls within a certain band—not too lean and not too rich. This entire band is known as the flammable-explosive range. It’s bounded on the lean side by the lower explosive limit (the minimum concentration needed for ignition) and on the rich side by the upper explosive limit (the maximum concentration that can still ignite). The fire point is about the temperature needed to keep a flame going, and the individual lower or upper explosive limits describe just one end of the range. So the term that best describes the whole range where ignition is possible is the flammable-explosive range.