Here you will find one or more explanations in English for the word hardness.
Also in the bottom left of the page several parts of wikipedia pages related to the word hardness and, of course, hardness synonyms and on the right images related to the word hardness.
Hardness
Hardness Hard"ness, n. [AS. heardness.]
1. The quality or state of being hard, literally or
figuratively.
The habit of authority also had given his manners
some peremptory hardness. --Sir W.
Scott.
2. (Min.) 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.
3. (Chem.) 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.
Note: This quality is caused by the presence of calcium
carbonate, causing temporary hardness which can be
removed by boiling, or by calcium sulphate, causing
permanent hardness which can not be so removed, but may
be improved by the addition of sodium carbonate.
Meaning of hardness from wikipedia
- In
materials science,
hardness (antonym: softness) is a
measure of the
resistance to
localized plastic deformation, such as an
indentation (over an area)...
- The Mohs
scale (/moʊz/ MOHZ) of
mineral hardness is a
qualitative ordinal scale, from 1 to 10,
characterizing scratch resistance of
minerals through the...
-
Vickers Hardness,
Rockwell Hardness,
Superficial Hardness,
Knoop Hardness,
Scleroscope Hardness, and Leeb
Hardness" (2019)
Hardness Conversion Table – Brinell...
- benefits. It can pose
critical problems in
industrial settings,
where water hardness is
monitored to
avoid costly breakdowns in boilers,
cooling towers, and...
- In com****tional
complexity theory, a com****tional
problem H is
called NP-hard if, for
every problem L
which can be
solved in non-deterministic polynomial-time...
- The
Vickers hardness test was
developed in 1921 by
Robert L.
Smith and
George E.
Sandland at
Vickers Ltd as an
alternative to the
Brinell method to measure...
- The
Rockwell scale is a
hardness scale based on
indentation hardness of a material. The
Rockwell test
measures the
depth of
penetration of an indenter...
-
Hardness scales may
refer to:
Scratch hardness The Mohs
scale of
mineral hardness The
Vickers hardness test The
Brinell scale The
Janka hardness test The...
-
Carbonate hardness, is a
measure of the
water hardness caused by the
presence of
carbonate (CO2− 3) and
bicarbonate (HCO− 3) anions.
Carbonate hardness is usually...
-
Indentation hardness tests are used in
mechanical engineering to
determine the
hardness of a
material to deformation.
Several such
tests exist, wherein...
