Which range represents the explosive range (.7 to 5%)?

Which range represents the explosive range (.7 to 5%)?

• A. 0 to .6
• B. More than 5 percent of
• C. .7 to 5%
• D. 0 to 1%

Answer: (C)

Explosive range is the window of vapor concentration in air that can ignite when an ignition source is present. It’s defined by the lower and upper explosive limits: below the lower limit the mixture is too lean to ignite, and above the upper limit it’s too rich to ignite. For this substance, the lower explosive limit is 0.7% and the upper explosive limit is 5%. Therefore, the explosive range is 0.7% to 5% by volume in air, where ignition is possible. Concentrations outside this range cannot ignite.

Explosive range is the window of vapor concentration in air that can ignite when an ignition source is present. It’s defined by the lower and upper explosive limits: below the lower limit the mixture is too lean to ignite, and above the upper limit it’s too rich to ignite. For this substance, the lower explosive limit is 0.7% and the upper explosive limit is 5%. Therefore, the explosive range is 0.7% to 5% by volume in air, where ignition is possible. Concentrations outside this range cannot ignite.