泡消火器, or foam fire extinguishers, are devices designed to combat fires, particularly those involving flammable liquids. They work by creating a blanket of foam that smothers the flames, cutting off the fire's oxygen supply. This type of extinguisher is effective for Class A (solid materials) and Class B (liquids) fires. These extinguishers are typically filled with a mixture of water and foam concentrate. When activated, the foam expands and forms a thick layer over the burning material. Proper training in using a 泡消火器 is essential for safety and effectiveness during emergencies.