Question

How foam type fire extinguisher works? Why saponin is added to sodium bicarbonate?

Answer 1

Water extinguishers work by removing heat from the fire. Dry chemicalextinguishers are tanks of foam or dry powder with compressed nitrogen as the propellant. They work by smothering the fire: when you put a layer of powder or foam on the fire, you cut the fuel off from the oxygen around it, and the fire goes out.
when you use the foam type Fire extinguisher when you press the nozzle there is the walls open mixing the two chemicals and their react to form form which covers of the fire and Cuts of the supply of the oxygen therefore depleting the .