Ohio Volunteer Firefighter Practice Exam

When propane is released into the atmosphere, it behaves as a heavier-than-air gas. This is due to its molecular weight, which is greater than that of air. Consequently, propane tends to accumulate in low-lying areas or depressions rather than dispersing into the atmosphere.

Understanding this property is crucial for safety during firefighting operations or when handling propane. If there's a leak, firefighters need to be aware of the risks associated with propane pooling in lower areas, as this not only affects ventilation but also creates potential ignition hazards.

It's important to recognize that, while propane can evaporate quickly when released in a pressurized state, its heavier-than-air characteristic fundamentally influences how it will behave when escaping into the environment. Therefore, knowledge of propane’s specific properties assists in effective risk assessment and emergency response planning.