hardness

English dictionary entry

Meanings

noun

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

härdʹnəs /ˈhɑɹdnəs/ /ˈhɑːdnəs/ en-us-hardness.ogg

hardness hardnesses hardnesse

From Middle English hardness, hardnesse, from Old English heardnes, from heard + -nes, equivalent to hard + -ness.

callosity durity firmness hardness induration inflexibility rigidity renitence renitency stiffness temper

softness

hardiness bone cement concrete crystal oak metal iron steel rock stone diamond flint granite marble hard harden

hardness of hearing Knoop hardness macrohardness microhardness nanohardness total hardness Vickers hardness water hardness

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