By doing so, its stream achieves a greater surface area, and thus a greater rate of heat absorption, which, when compared to that of a smoothbore nozzle, speeds its transformation into the steam that smothers the fire by displacing its oxygen.
By increasing its surface area, the stream achieves a greater rate of heat absorption, which, when compared to a smoothbore nozzle, accelerates its transformation into steam that extinguishes the fire by displacing its oxygen.