What is the principle of foam fire extinguishers?

[VonFernando]

Foam fire extinguishers work based on their ability to produce large amounts of carbon dioxide and generate copious foam. The foam covers the flames, cutting off their oxygen supply. Since fire cannot burn without oxygen, this effectively extinguishes the fire. Below are detailed information: 1. Scope of application: Foam fire extinguishers are particularly suitable for extinguishing fires caused by materials like wood, cotton cloth, or linen, as well as fires involving petroleum or grease. In case of a kitchen fire involving electrical appliances or flammable liquids, this type of foam fire extinguisher can be used. 2. Types: Foam fire extinguishers are mainly categorized into three types: portable foam fire extinguishers, air foam fire extinguishers, and wheeled foam fire extinguishers.