hardness

/HH AA1 R D N AH0 S/

noun

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

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