What are the flammable limits for motor gasoline?

What are the flammable limits for motor gasoline?

• A. 5.3% to 7% mixture in air
• B. 0.9% to 5.9% mixture in air
• C. 1.4% to 7.6% mixture in air
• D. 2.5% to 12.8% mixture in air

Answer: (C)

Motor gasoline has flammable limits that dictate the range of vapor concentrations in air that can ignite and support combustion. The correct answer indicates that these limits are between 1.4% and 7.6% by volume in air. This range signifies that below 1.4%, the mixture is too lean to sustain ignition, meaning there isn’t enough gasoline vapor to support combustion. Conversely, beyond 7.6%, the mixture is too rich; there’s too much gasoline vapor and not enough air, which also prevents ignition. Understanding these flammable limits is critical for safety in operations involving motor gasoline. It helps in assessing hazards during handling, storage, and transfer processes, ensuring that the working environment remains safe from fire risks. The other values presented fall outside the accepted range for motor gasoline and therefore do not accurately reflect its behavior in air concerning ignition.

Motor gasoline has flammable limits that dictate the range of vapor concentrations in air that can ignite and support combustion. The correct answer indicates that these limits are between 1.4% and 7.6% by volume in air.

This range signifies that below 1.4%, the mixture is too lean to sustain ignition, meaning there isn’t enough gasoline vapor to support combustion. Conversely, beyond 7.6%, the mixture is too rich; there’s too much gasoline vapor and not enough air, which also prevents ignition.

Understanding these flammable limits is critical for safety in operations involving motor gasoline. It helps in assessing hazards during handling, storage, and transfer processes, ensuring that the working environment remains safe from fire risks.

The other values presented fall outside the accepted range for motor gasoline and therefore do not accurately reflect its behavior in air concerning ignition.