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
Carlo Janka February, interrupting accessory electrical pathways to the heart. These unnecessary extra pathways had caused his heart rate to behave abnormally during exercise and stress, posing possibly severe risks. Janka recovered well from the catheterization and resumed training five days later, winning the giant slalom at Kranjska Gora, Slovenia, on 5 March for his sole victory of the 2011 season. Janka switched equipment following the 2014 season, from Atomic to Rossignol. ^ Carlo Janka Carlo Janka (born 15 October 1986) is an alpine ski racer from Switzerland. Born in Obersaxen, in the canton of Graubünden, he had the winter sports facilities