The main principle of water cannon fire extinguishing

First of all, we must understand the conditions of the flame, so as to affect its combustion by affecting its combustion conditions. 1. reach the ignition point. 2. There is enough oxygen (air) to contact with it. Therefore, the principle of foam fire extinguishing is the first one, which reduces the ignition point of flame combustion. Foam extinguisher's principle is to prevent the flame from touching the air.