roughness
Noun
Meaning
The quality or state of being rough.
Source: Webster's dictionarySynonyms
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Examples
the crudeness of frontier dwellings depressed her
men associate the roughness of nonstandard working-class speech with masculinity
the roughness of her voice was a signal to keep quiet
A limiting factor on the validity of this result is the roughness of the sphere being used.
Another important function to a geometrically correct shape is to provide it with a specific surface roughness as per design requirements for optimum lubrication hydrodynamics (essential for crankshafts in engines with stop/start fuel saving technology).
Arguably, the roughness is in the exhaust note, rather than noticeable vibration, so the perceived smoothness is rather good at higher RPM.