Micri-
Micri- (unit symbol mc-) is an archaic non-SI decimal metric prefix for 10. It was proposed as a prefix for the CGS-unit of energy, the erg. The "micrierg" was proposed in 1922 by William Draper Harkins as a unit of energy equating to 10 erg, the equivalent to 10 joule, as a convenient unit to measure the surface energy of molecules in surface chemistry. It saw limited use. One electronvolt is about 160 micriergs. In 1991, the micrierg was officially designated the "zeptojoule" when the "zepto"- prefix for 10 was officially adopted.