Definiciones
1.NounThe quality of being hard.
2.NounAn instance of this quality; hardship.
3.NounThe quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm).
4.NounThe resistance to scratching, cutting, indentation or abrasion of a metal or other solid material.
5.NounThe penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation.
6.NounThe measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack.
7.NounA measure of how hard a material is."The hardness of the material was high."