How many times heavier than air is chlorine gas?

Chlorine gas is approximately 2.5 times heavier than air. This means that when chlorine is released into the atmosphere, it tends to sink or accumulate in lower-lying areas rather than diffuse evenly with the air. The molecular weight of chlorine gas (Cl2) is about 70.9 g/mol, while the average molecular weight of air is roughly 29 g/mol. By comparing these molecular weights, it becomes clear that chlorine's greater weight causes it to behave differently from lighter gases. Understanding this property is crucial for operators when assessing potential hazards and planning safety measures, as the accumulation of chlorine gas can pose serious risks.