the.com/roughness
the texture you feel before you understand it, measured in microns and braille
means The quality of having an uneven, coarse, or jagged surface or texture, or by extension a lack of smoothness in manner, sound, or treatment.
from From "rough," which traces back to Old English "ruh" — meaning hairy, coarse, or shaggy — with the noun-forming suffix "-ness" that turns a quality into a thing you can name. "Ruh" has Germanic cousins, like Dutch "ruw" and German "rauh," all clustered around the same idea of something bristly and unfinished to the touch.
- unit
- measured in microns, finer than a human hair
- grip secret
- perfectly smooth surfaces slip; tires need controlled roughness
- shark skin
- microscopic toothy grooves cut drag underwater
- engineered low
- telescope mirrors polished to nanometer roughness
- sound
- acoustic dissonance is literally called auditory roughness
ra parameter — standard surface roughness measurement in micrometers, used in manufacturing quality control
mohs hardness scale — 1-10 scale where roughness correlates to mineral surface texture, diamond at 10
sandpaper grit ratings — 60-2000+ grit scale measuring abrasive particle size, lower numbers = rougher surfaces