File:Fse-aqueous-film-forming-foam-v2.svg

Fse-aqueous-film-forming-foam-v2.svg (SVG file, nominally 900 × 600 pixels, file size: 7 KB)

Summary

The spreading coefficient balances the surface tension of the fuel against the surface tension of the AFFF solution and the interfacial tension; a positive value allows a film to spread. Based on Scheffey (2002), p. 4-93.

Original vector illustration for Aqueous film-forming foam, level 2 Intermediate.

Source basis: Scheffey (2002), p. 4-93 (Equation 9 and definitions), p. 4-94 (film formation observations)
Alt text: Edge of a thin solution layer on fuel with three arrows: fuel surface tension pulling outward, solution surface and interfacial tension pulling back.

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New drawing by Fire Safety Academy. © Fire Safety Academy.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:19, 2 November 2026		900 × 600 (7 KB)	Lisa (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Aqueous film-forming foam

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Short title	The spreading coefficient balances the surface tension of the fuel against the surface tension of the AFFF solution and the interfacial tension; a positive value allows a film to spread. Based on Scheffey (2002), p. 4-93.
Image title	Edge of a thin solution layer on fuel with three arrows: fuel surface tension pulling outward, solution surface and interfacial tension pulling back. Source basis: Scheffey (2002), p. 4-93 (Equation 9 and definitions), p. 4-94 (film formation observations)
Width	900
Height	600