Before revision: Once a fire has started, the resulting exothermic chain reaction sustains the fire and allows it to continue until or unless at least one of the elements of the fire is blocked: - foam can be used to deny the fire the oxygen it needs - water can be used to lower the temperature of the fuel below the ignition point, or to remove or disperse the fuel.
After revision: Once a fire has started, the resulting exothermic chain reaction sustains the fire and allows it to continue until or unless at least one of the elements of the fire is blocked: foam can be used to deny the fire the oxygen it needs water can be used to lower the temperature of the fuel below the ignition point, or to remove or disperse the fuel.