The explosive mixture range of acetylene in air is expressed as which percent range?

The explosive mixture range of acetylene in air is expressed as which percent range?

• A. 2.5 - 80%
• B. 5 - 95%
• C. 1 - 10%
• D. 10 - 50%

Answer: (A)

Acetylene will ignite only if its concentration in air falls between its lower and upper explosive limits. For acetylene, this range is about 2.5% to 80% by volume in air. Below 2.5%, the mixture is too lean to ignite; above 80%, it’s too rich to sustain a flame. The option 2.5% to 80% matches these LEL/UEL values, making it the correct range. The other ranges don’t reflect acetylene’s actual flammable limits.

Acetylene will ignite only if its concentration in air falls between its lower and upper explosive limits. For acetylene, this range is about 2.5% to 80% by volume in air. Below 2.5%, the mixture is too lean to ignite; above 80%, it’s too rich to sustain a flame. The option 2.5% to 80% matches these LEL/UEL values, making it the correct range. The other ranges don’t reflect acetylene’s actual flammable limits.