the world > matter > properties of materials > temperature > coldness > extinguishing fire > [noun] > fire-fighting > a substance or apparatus for extinguishing > foam (3)
A mass or layer of foam used in fire-fighting, produced by adding a foaming agent to a flow of water or by other means; also, a foaming agent so…
Originally British. A water-based foam used in firefighting. Cf. foam, n. 1d.
A foam used in firefighting which floats on flammable liquids lighter than water, formed by mixing water with a fluorocarbon surfactant.