The Rockwell Hardness test is a hardness measurement based on the net increase in depth of impression as a load is applied. Hardness numbers have no units and are commonly given in the R, L, M, E and K scales. The higher the number in each of the scales means the harder the material.
Apac. Apac is a town in Apac District, Northern Uganda. It is the 'chief town' of the district and the district headquarters are located there. The district is named after the town. see more on Definitions.net Â».
Nomenclature and common formula[edit] When part of a salt, the formula of the acetate ion is written as CH3CO2â, C2H3O2â, or CH3COOâ. Chemists abbreviate acetate as OAcâ or AcOâ. Thus, HOAc is the abbreviation for acetic acid, NaOAc for sodium acetate, and EtOAc for ethyl acetate.