Opacity definition

Opacity means the degree to which emissions reduce the transmission of light and obscure the view of an object in the background.

Opacity means the degree to which an object seen through a plume is obscured, stated as a percentage.

Opacity means that property of a substance tending to obscure vision and is measured as percent obscuration.

Examples of Opacity in a sentence

• Therefore, the observations for presence, or lack of, visible emissions do not require that they be performed by a person certified as a qualified observer for EPA Method 9 for Visual Determination of the Opacity of Emissions from Stationary Sources.

• EU Method B.47 – Bovine Corneal Opacity and Permeability (BCOP) Test Method) and GLP certified - Good Laboratory Practices.

• This observation does not require that it be performed by a person certified as a qualified observer for EPA Method 9 for Visual Determination of the Opacity ofEmissions from Stationary Sources.

• Opacity is measured in percent; 100% opacity is when an object is totally obscured by the smoke column from a chimney, and 0% opacity means that no smoke column can be seen.

• Note color changes in comments section.• Visible Water Vapor Present?: check “yes” if visible water vapor is present.• If Present, is Plume…: check “attached” if water droplet plume forms prior to exiting stack, and “detached” if water droplet plume forms after exiting stack.• Point in Plume at Which Opacity was Determined: describe physical location in plume where readings were made (e.g., 1 ft above stack exit or 10 ft.

More Definitions of Opacity

Opacity means the capacity to obstruct the transmission of light, expressed as percent.

Opacity means a state which renders material partially or wholly impervious to rays of light and causes obstruction of an observer's view.

Opacity means an optical measurement of the density of particulate matter in the exhaust flow of an engine, expressed in m-1;

Opacity means the percentage of light obstructed from passage through an exhaust smoke plume.

Opacity means the degree to which emissions, excluding uncombined water, reduce the transmission of light and obscure the view of an object in the background as measured by EPA Method 9 or other method, as specified in each applicable rule.

Opacity means the fraction of a beam of light, expressed in percent, which fails to penetrate a plume of smoke.

Opacity means that condition which renders material partially or wholly impervious to rays of light and causes a degree of obstruction to an observer's view.