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Chlorine gas is indeed heavier than air, which is a critical characteristic when considering its behavior and safety measures in wastewater treatment and other applications. Being heavier than air means that chlorine gas will tend to accumulate in low-lying areas and can pose a significant risk if released into the environment, as it can displace oxygen and create hazardous conditions for workers and the environment.

This property is vital for operators to understand; in the case of a chlorine leak, this behavior necessitates prompt action to ventilate and monitor areas where the gas may have settled. Additionally, the heavier-than-air characteristic prompts the need for proper ventilation systems in facilities where chlorine is used, ensuring that adequate air circulation can mitigate the risks associated with its accumulation.

Understanding chlorine's physical properties is essential for safety protocols and emergency response measures, and this knowledge helps ensure the safe handling and effective use of chlorine in water treatment processes.