karkeudesta

Karkeudesta is the Finnish genitive form of karkeus, meaning roughness, coarseness, or texture. In Finnish-language text, karkeudesta is used to refer to the roughness of a surface or the granularity of a material, often with the sense “of roughness” in a descriptive phrase.

In engineering and materials science, karkeus describes the micro- and macro-scale irregularities that affect function and appearance. Surface roughness influences friction, wear, coating adhesion, light scattering, and tactile perception. Typical contexts include machining, finishing processes, and textile fiber textures, as well as powder and granular materials where granularity determines flow and packing.

Measurement and parameters: Roughness is quantified with parameters such as Ra (average roughness), Rz (mean peak-to-valley height), and Rq (root-mean-square roughness). Measurements are performed with stylus profilometers or optical methods, following standards like ISO 4287. The parameter values are reported in micrometres and used to specify manufacturing tolerances and quality criteria.

Linguistic note: The form -sta (karkeudesta) marks the elative/genitive in Finnish, used when describing something caused by or related to roughness. Example usage can include phrases like karkeudesta johtuvat hankaluudet, meaning difficulties arising from roughness.

See also: Surface roughness, Profilometry, Ra, Rz, ISO 4287.