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thumbIn materials science, asperity, defined as "unevenness of surface, roughness, ruggedness" (from the Latin asper--"rough"), has implications (for example) in physics and seismology. Typical "smooth surfaces", even those polished to a mirror finish, are still not truly smooth on a microscopic scale. They are rough, with sharp, rough, or rugged projections, termed "asperities".

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