opacit

Opacit is a term that may appear as a variant spelling of opacity or as a shorthand in certain fields. It does not correspond to a single, universally defined concept and is not widely standardized in reference works. In practice, uses of opacit generally relate to the degree to which something blocks or hinders the passage of light, information, or signals.

Opacity, in optics and related disciplines, describes how strongly a material resists the transmission of light. It is influenced by absorption, scattering, and reflection. Opacity is often quantified in terms of transmittance or absorbance, with many models using wavelength-dependent opacities to describe radiative transfer in media such as gases, plasmas, and stellar atmospheres.

In computer graphics and digital imaging, opacity (often represented as an alpha channel) determines the visibility of a pixel or layer. An opacity value of zero yields full transparency, while a value of one yields full opacity. The term opacit may appear as a typographical variant or a variable name in code.

In materials science and chemistry, opacity relates to how pigments, dyes, or particulate suspensions obstruct light. Measurements may rely on spectrophotometry, attenuation coefficients, or the calculation of mass absorption, depending on the material and wavelength range.

See also: opacity, alpha channel, transmittance, absorbance, radiative transfer.