California ICC UST Service Technician Practice Exam

Asphyxiation is most likely to occur in areas where which type of vapors accumulate?

1. Heavier-than-air vapors

2. Lighter-than-air vapors

3. Flammable vapors

4. Neutral vapors

The correct answer is: Heavier-than-air vapors

Asphyxiation is most likely to occur in areas where heavier-than-air vapors accumulate because these vapors tend to settle in low-lying areas. Heavier-than-air vapors, such as those from certain gases or fluids, will not disperse quickly into the atmosphere. Instead, they can displace oxygen in confined or low-lying spaces, leading to an increased risk of asphyxiation for individuals in those areas. Recognizing the behavior of various vapors is crucial for safety protocols, especially in environments where hazardous materials are present. On the other hand, lighter-than-air vapors rise and are less likely to accumulate at ground level, thus reducing the chance of asphyxiation. Flammable vapors may pose fire hazards, but they do not specifically indicate a risk of asphyxiation unless they are also heavier-than-air and displacing oxygen. Neutral vapors typically do not react and are less likely to create a suffocation risk. Understanding these properties helps in assessing potential safety hazards in various environments.