File:Fse-optical-density-v1.svg

Fse-optical-density-v1.svg (SVG file, nominally 900 × 600 pixels, file size: 7 KB)

Summary

The two logarithm conventions describe the same transmission but use different coefficients. Based on Mulholland (2002), p. 2-263.

Original illustration for Optical density, level 3 Advanced.

Source basis: Mulholland (2002), p. 2-263, equations 7–9.
Alt text: A light beam crosses smoke; natural-log extinction and base-ten optical density are related by ln(10).
Accuracy notes: Keep DL dimensionless; do not label optical density a mass concentration.

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

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:35, 2 November 2026		900 × 600 (7 KB)	Emma (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Short title	The two logarithm conventions describe the same transmission but use different coefficients. Based on Mulholland (2002), p. 2-263.
Image title	A light beam crosses smoke; natural-log extinction and base-ten optical density are related by ln(10). Source basis: Mulholland (2002), p. 2-263, equations 7–9.
Width	900
Height	600