Chlorine gas is approximately how many times heavier than air?

Chlorine gas is approximately 2.5 times heavier than air. This measurement is significant because it helps in understanding how chlorine behaves in the environment. Being heavier than air means that chlorine gas will tend to accumulate at lower levels in enclosed spaces or areas where ventilation is poor, posing potential hazards if not handled properly. This is particularly relevant for pool contractors and service personnel, as ensuring proper ventilation and safety measures become critical during the handling of chlorine for pool sanitation. Recognizing the weight of chlorine gas in relation to air allows for better safety protocols and risk assessments when working with this chemical.