File:Fse-equivalence-ratio-v1.svg

Fse-equivalence-ratio-v1.svg (SVG file, nominally 900 × 600 pixels, file size: 8 KB)

Summary

Below an equivalence ratio of 1 a fire has oxygen to spare; above 1 part of the fuel leaves unburnt or as carbon monoxide. Based on Gottuk and Lattimer (2002), p. 2-58.

Original illustration for Equivalence ratio, level 4 Expert.

Source basis: Gottuk and Lattimer (2002), p. 2-58 (regimes and products for φ < 1, = 1, > 1)
Alt text: Scale of the equivalence ratio from 0 to 3 with a lean zone, the stoichiometric point at 1 and a rich zone with CO and unburnt fuel.

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

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:10, 2 November 2026		900 × 600 (8 KB)	Jan (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Equivalence ratio

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Short title	Below an equivalence ratio of 1 a fire has oxygen to spare; above 1 part of the fuel leaves unburnt or as carbon monoxide. Based on Gottuk and Lattimer (2002), p. 2-58.
Image title	Scale of the equivalence ratio from 0 to 3 with a lean zone, the stoichiometric point at 1 and a rich zone with CO and unburnt fuel. Source basis: Gottuk and Lattimer (2002), p. 2-58 (regimes and products for φ < 1, = 1, > 1)
Width	900
Height	600