For Ringelmann Chart we have terms and definitions in 2 topics. The topics are Air Quality and Boiler.

Ringelmann Chart (Air Quality)

Actually a series of charts, numbered 0 to 5, that simulate various smoke densities, by presenting different percentages of black. A Ringelmann No. 1 is equivalent to 20 percent black; a Ringelmann No. 5 is 100 percent black. They are used for measuring the opacity or equivalent obscuration of smoke arising from stacks and other sources by matching the actual effluent with the various numbers, or densities, indicated by the charts

Ringelmann Chart (Boiler)

A series of four rectangular grids of black lines of varying widths printed on a white background, and used as a criterion of blackness for determining smoke density in stack gas streams.

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