What means do all portable fire extinguishers use for expelling their contents?

Portable fire extinguishers expel their contents through the use of pressure. This pressure is typically created by a gas, such as nitrogen or carbon dioxide, that is stored in a separate chamber within the extinguisher. When the operator activates the extinguisher, the pressure forces the extinguishing agent out through the nozzle, allowing for effective application to the fire.

The mechanism of pressure is crucial for the efficient functioning of extinguishers, as it enables a controlled and directed discharge. This is particularly important for reaching the flames and effectively suppressing them. The pressure system also allows the operator to maintain distance from the fire while applying the extinguishing agent, enhancing safety during firefighting efforts.