Fire Extinguisher (A and B)

 Foam extinguishers are commonly used for Class A and B fires. Here's how they work for each class:

1. Class A Fires: 

These involve solid materials such as wood, paper, or textiles. Foam extinguishers work by cooling the fire and creating a barrier between the fuel and the oxygen, which helps to suppress and extinguish the fire.

2.Class B Fires:

 These involve flammable liquids such as petrol, oil, or paints. Foam extinguishers form a thick layer of foam on the surface of the burning liquid, cutting off the oxygen supply and preventing re-ignition. The foam also cools the fuel to help extinguish the fire.

However, foam extinguishers are not suitable for Class C (gas) or Class D (metal) fires, and they should never be used on live electrical equipment unless they are specifically marked as safe for electrical fires.