hardness (redirected from Hard matter)

hardness (of a substance),

n the ability of a material to resist an indenting type of load.

hardness (of radiographs),

n a term used to indicate in a general way the quality of x-radiation, with hardness being a function of the wavelength; the shorter the wavelength, the harder the x-radiation.

hardness, Mohs,

n a relative scratch resistance of minerals based on an arbitrary scale: 10, diamond; 9, corundum; 8, topaz; 7, quartz; 6, orthoclase; 5, apatite; 4, fluorite; 3, calcite; 2, gypsum; and 1, talc.

hardness tests,

See tests, hardness.