Definitions for "Hardness"
The cohesion of the particles on the surface of a body, determined by its capacity to scratch another, or be itself scratched; -- measured among minerals on a scale of which diamond and talc form the extremes.
The peculiar quality exhibited by water which has mineral salts dissolved in it. Such water forms an insoluble compound with soap, and is hence unfit for washing purposes.
1) The relative resistance of a mineral to scratching, as measured by the Mohs' scale. 2) The relative resistance of a metal to denting, scratching or bending.
1 - Talc 2 - Gypsum 3 - Calcite 4 - Fluorite 5 - Apatite 6 - Orthoclase 7 - Quartz 8 - Topaz 9 - Corundum 10 - Diamond
excessive sternness; "severity of character"; "the harshness of his punishment was inhuman"; "the rigors of boot camp"
Keywords:  devoid, passion, feeling
devoid of passion or feeling
Keywords:  opal, emerald
Opal is 5.5 to 6.5 or harder, similar to Emerald.
Keywords:  knife, blade
5.5 - Knife Blade
The quality or state of being hard, literally or figuratively.
the quality of being difficult to do; "he assigned a series of problems of increasing hardness"
The quality of a man's erection.
Keywords:  something
How hard something is.
Keywords:  heat
1/4ÓÈÈ Heat