A carbon dioxide extinguisher's principle means of discharge is:

A carbon dioxide extinguisher's principle means of discharge is:

• A. Stored pressure
• B. Chemical reaction
• C. Cartridge activation
• D. Manual hand-pump

Answer: (A)

The main idea is that this type of extinguisher relies on stored pressure. The carbon dioxide and the pressure that pushes it out are already inside the cylinder, so when you open the valve, CO2 is released directly as a gas without needing a separate cartridge or an external pump. Because CO2 is stored under high pressure as liquid, it flashes to gas as it exits, creating a cold, blanket-like plume that helps smother the flame and displace oxygen. Another discharge method would involve puncturing a cartridge or manually pumping, but those aren’t how CO2 extinguishers operate.

The main idea is that this type of extinguisher relies on stored pressure. The carbon dioxide and the pressure that pushes it out are already inside the cylinder, so when you open the valve, CO2 is released directly as a gas without needing a separate cartridge or an external pump. Because CO2 is stored under high pressure as liquid, it flashes to gas as it exits, creating a cold, blanket-like plume that helps smother the flame and displace oxygen. Another discharge method would involve puncturing a cartridge or manually pumping, but those aren’t how CO2 extinguishers operate.