File:Fse-habers-rule-v4.svg

Fse-habers-rule-v4.svg (SVG file, nominally 900 × 600 pixels, file size: 10 KB)

Summary

Worked example: fractional incapacitating dose for 15 minutes at 90 ppm followed by 2 minutes at 180 ppm of hydrogen cyanide, with and without Haber's rule. Based on Purser (2002), p. 2-105.

Original illustration for Haber's rule, level 4 Expert.

Source basis: Purser (2002), p. 2-105 (example of 90 ppm for 15 min and 180 ppm for 2 min; Equations 9 and 10; total 1.111); Haber's rule line calculated for the article's worked example.
Alt text: Top: hydrogen cyanide at 90 ppm for 15 minutes then 180 ppm for 2 minutes. Bottom: fraction rising past 1, Haber line staying near 0.7.

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

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:24, 2 November 2026		900 × 600 (10 KB)	Jan (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Haber's rule

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Short title	Worked example: fractional incapacitating dose for 15 minutes at 90 ppm followed by 2 minutes at 180 ppm of hydrogen cyanide, with and without Haber's rule. Based on Purser (2002), p. 2-105.
Image title	Top: hydrogen cyanide at 90 ppm for 15 minutes then 180 ppm for 2 minutes. Bottom: fraction rising past 1, Haber line staying near 0.7. Source basis: Purser (2002), p. 2-105 (example of 90 ppm for 15 min and 180 ppm for 2 min; Equations 9 and 10; total 1.111); Haber's rule line calculated for the article's worked example.
Width	900
Height	600