Illinois Basic Operations Firefighter (BOF) State Practice Exam 2025 - Free Firefighter Exam Practice Questions and Study Guide

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What will vapors and gases with a vapor density less than 1 typically do?

Sink to the ground

Float as a cloud

Vapors and gases with a vapor density less than 1 are generally lighter than air. Because of this, they will tend to rise and float as a cloud when released into the atmosphere. This characteristic is important in understanding how certain chemicals behave during a spill or leak scenario. Recognizing that these lighter vapors can disperse upwards allows firefighters and emergency responders to make informed decisions about ventilation and potential hazards when dealing with such substances.

In contrast, vapors that have a vapor density greater than 1 would typically sink and accumulate closer to the ground, while those with a vapor density of exactly 1 would remain stable at ground level. Understanding these behaviors aids in predicting the movement of hazardous materials in different environments and can significantly influence safety protocols during firefighting operations.

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Disperse rapidly in the air

Remain stable at ground level

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