Firefighter Practice Exam

What dilution of ethylene oxide with water is required to effectively inhibit its flammability?

1. 10:1

2. 16:1

3. 24:1

4. 32:1

The correct answer is: 24:1

The correct answer, which indicates that a dilution of ethylene oxide with water at a ratio of 24:1 is required, is based on the understanding of the properties of ethylene oxide as a flammable gas and its behavior when mixed with water. Ethylene oxide is highly flammable, and focusing on the necessary precautions in handling it is crucial. Diluting ethylene oxide with water at a 24:1 ratio ensures that there is enough water to effectively reduce the concentration of ethylene oxide in the mixture, thereby lowering its flammability. This specific dilution ratio is rooted in the chemistry of the substance, as a certain amount of water is needed to blanket the gas, reducing its ability to combust. Understanding the specific ratio for achieving this safety threshold is critical for firefighters and hazardous material handlers, especially in scenarios involving fire suppression and safe transport of chemicals. This concentration helps create a non-flammable environment, minimizing the risk of ignition and subsequent fire hazards. Thus, the 24:1 dilution ratio represents an established and recognized standard in the industry for mitigating the flammability risk associated with ethylene oxide, making it the most effective choice among the options provided.