Chlorine gas is considered to be...

Chlorine gas is denser than air, making it an important characteristic to understand in the context of safety and handling. As a heavier-than-air gas, chlorine tends to settle in low-lying areas, which can lead to hazardous situations if not properly managed. This property highlights the need for proper ventilation and monitoring in environments where chlorine gas is used, such as in water treatment facilities.

In contrast, chlorine gas is not flammable; it does support combustion, but it does not ignite like a typical flammable gas. Additionally, it is toxic at even low levels, which is a significant consideration for workers handling the gas, as exposure can lead to serious health issues. Recognizing that chlorine is not harmless emphasizes the importance of safety protocols when interacting with this chemical. This understanding is crucial for drinking water treatment operators who must manage chlorine's use in disinfection processes while ensuring safety for both workers and the public.