Variation of surface geometry over a specified range of spatial scales. Its optical effects depend on scale relative to wavelength and imaging resolution, material and illumination; perceived roughness is not a direct measurement of one universal roughness parameter.
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Surface roughness is a measure of the texture of a surface, defined by the presence of irregularities or deviations from a perfectly smooth surface. It quantifies the finer details of the surface profile, which can significantly affect the performance and functionality of a component in various applications, including manufacturing, engineering, and tribology (the study of friction, wear, and lubrication).