Question

what is the principle of fire extinguishing

Answer 1

cutting of the oxygen supply and reducing temperature so as to inhibit the process of combustion

Answer 2

Water extinguishers work by removing heat from the fire. Dry chemical extinguishersare tanks of foam or dry powder with compressed nitrogen as the propellant. They work by smothering thefire: when you put a layer of powder or foam on the fire, you cut the fuel off from the oxygen around it, and the firegoes out.