Which extinguishing agent primarily works by diluting the oxygen concentration around the flame, without causing significant cooling or chain reaction interruption?

The extinguishing agent that primarily works by diluting the oxygen concentration around the flame, without causing significant cooling or chain reaction interruption, is an inert gas extinguishing agent. These agents, such as nitrogen, argon, or blends like IG-55 (a mixture of nitrogen and argon), function by reducing the amount of oxygen available to the fire. To understand this, it's essential to recall the concept of the fire triangle, which states that a fire requires three components to ignite and sustain itself: fuel, heat, and oxygen. By removing or sufficiently reducing any one of these components, the fire can be extinguished. Inert gas extinguishing agents operate on the principle of oxygen dilution. Normal atmospheric air contains a....