Definitions for opacityoʊˈpæs ɪ ti
This page provides all possible meanings and translations of the word opacity
the phenomenon of not permitting the passage of electromagnetic radiation
incomprehensibility resulting from obscurity of meaning
the quality of being opaque to a degree; the degree to which something reduces the passage of light
The state or quality of being opaque, not allowing light to pass through
We could not see the sandbar due to the opacity of the muddy water.
The state or quality of being inaccessible to understanding
The opacity of these decisions is troubling.
A measure of relative impenetrability to electromagnetic radiation such as light.
The opacity of a clean glass window is near zero.
Origin: From opacité.
Opacity is the measure of impenetrability to electromagnetic or other kinds of radiation, especially visible light. In radiative transfer, it describes the absorption and scattering of radiation in a medium, such as a plasma, dielectric, shielding material, glass, etc. An opaque object is neither transparent nor translucent. When light strikes an interface between two substances, in general some may be reflected, some absorbed, some scattered, and the rest transmitted. Reflection can be diffuse, for example light reflecting off a white wall, or specular, for example light reflecting off a mirror. An opaque substance transmits no light, and therefore reflects, scatters, or absorbs all of it. Both mirrors and carbon black are opaque. Opacity depends on the frequency of the light being considered. For instance, some kinds of glass, while transparent in the visual range, are largely opaque to ultraviolet light. More extreme frequency-dependence is visible in the absorption lines of cold gases. Opacity can be quantified in many ways; for example, see the article mathematical descriptions of opacity.
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