Firefighting foams have been in commercial use since the early 1900s. The National Fire Protection Association defines foam as: “a stable aggregation of bubbles of lower density than oil or water.” Foam is made up by three component parts: foam concentrate + water + energy. Energy can take the form of air or mechanical agitation and when added to foam solution (foam concentrate mixed with the appropriate amount of water) finished foam is produced through means of a discharge device. The finished foam is very fluid and readily flows over liquid surfaces to extinguish fire