Final answer:
A self-expelling fire extinguisher releases its fire-quenching agent automatically, often using a fluorinated solution suited for large organic liquid fires. Modern fire extinguisher systems incorporate foaming plastics to combat various types of fires.
Step-by-step explanation:
A self-expelling fire extinguisher refers to an extinguisher that releases its fire-quenching agent automatically when a fire is detected. These extinguishers often use a fluorinated solution which can spread across a fire's surface, effectively extinguishing it. This method is particularly suitable for fighting large-scale fires of organic liquids. While early fire extinguishers may have used dry-cleaning solvents, such practices are no longer recommended due to safety and environmental concerns.
Fire extinguisher systems have evolved to include foams that are capable of foaming plastics, providing a versatile solution for a variety of fire types. The technology behind these systems is designed to both suppress flames and prevent re-ignition, which is essential for ensuring safety in both domestic and commercial environments.