Wastewater Treatment Operator Certification Practice Test

Which is true about chlorine gas?

1. It is 2.5 times lighter than air

2. It is 2.5 times heavier than air

3. It is 1.5 times heavier than air

4. It is 1.5 times lighter than air

The correct answer is: It is 2.5 times heavier than air

Chlorine gas is indeed 2.5 times heavier than air, which makes it important to understand in the context of safety and handling during wastewater treatment operations. This characteristic affects how chlorine disperses in the atmosphere and leads to specific safety considerations for workers. Because chlorine is heavier than air, it tends to accumulate in low areas and can pose a risk if a leak occurs, potentially leading to higher concentrations that could be hazardous. Proper ventilation and monitoring are essential to manage this risk effectively. Understanding the physical properties of chlorine gas is crucial for wastewater treatment operators, as it influences the design and operation of gas handling systems, emergency evacuation procedures, and training on the use of personal protective equipment (PPE). Being aware of chlorine's density relative to air aids operators in anticipating its behavior in case of accidental release.