Chlorine gas is classified as which type of substance?

Chlorine gas is classified as a non-flammable compressed gas because it is stored under pressure in gas cylinders. While chlorine itself is reactive and can support combustion, it does not ignite or burn on its own, which distinguishes it from flammable gases. The classification as a compressed gas indicates that chlorine is in a gaseous state at normal temperature and pressure but becomes liquid when compressed, leading to its use in various industrial applications. Furthermore, while chlorine can be dangerous and poses health risks, its classification as non-flammable indicates its behavior with respect to fire hazards, making it essential to handle it correctly to ensure safety during wastewater treatment processes.