Hardness Hardness Hardness is a measure of the resistance to localized plastic deformation induced by either mechanical indentation or abrasion. Some materials (e.g. metals) are harder than others (e.g. plastics, wood). Macroscopic hardness is generally characterized by strong intermolecular bonds, but the behavior of solid materials under force is complex; therefore, there are different measurements of hardness: "scratch hardness", "indentation hardness", and "rebound hardness". Hardness is dependent on ductility, elastic stiffness, plasticity, strain, strength, toughness, viscoelasticity, and viscosity. Common examples of hard matter are ceramics, concrete, certain metals, and superhard materials, which can be contrasted with soft matter. There are three
Ahmed Janka Nabay and 2010. In June 2010, he formed a full band, Janka Nabay and the Bubu Gang, with members of four Brooklyn indie rock groups Skeletons, Gang Gang Dance, and Starring. In 2012, Janka's band announced that they had signed a three-album record deal with David Byrne's record label, Luaka Bop. Janka Nabay was of Mandingo and Temne descent, two of the ethnic groups within Sierra Leone. It was reported on April 2, 2018 that Janka Nabay had died. Causes of his death remain yet unknown. He was 54 years old. "Ahmed Janka Nabay, the Sierra Leonian musician renowned for pioneering