Hardness

approximates to the concentration of calcium and magnesium salts in water. Total hardness is the sum of carbonates and non-carbonate hardness. It may be expressed as degrees of hardness, millimoles per litre (expressed as calcium Equivalent), or as parts per million of CaCO3 equivalent.

Hardness

Hardness is a measure of how resistant solid matter is to various kinds of permanent shape change when a compressive force is applied. Macroscopic hardness is generally characterized by strong intermolecular bonds, but the behavior of solid materials under force is complex; therefore, there are different measurements of hardness: scratch hardness,...
Found on http://en.wikipedia.org/wiki/Hardness

hardness

The degree of resistance of a given mineral to scratching, indicating the strength of the bonds that hold the mineral's atoms together. The hardness of a mineral is measured by rubbing it with substances of known hardness.
Found on http://www.encyclo.co.uk/local/22290

hardness

The degree of resistance of a given mineral to scratching, indicating the strength of the bonds that hold the mineral's atoms together. The hardness of a mineral is measured by rubbing it with substances of known hardness.
Found on http://www.encyclo.co.uk/local/22291

Hardness

• (n.) 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. • (n.) The quality or state of being hard, literally or figuratively. • (n.) The cohesion of the particles on the surface of a body, determined by its capac...
Found on http://thinkexist.com/dictionary/meaning/hardness/

hardness

<chemistry> Total concentration of calcium and magnesium ions, expressed as the equivalent concentration (mg/L) of calcium carbonate. ... Hard water is water that contains lots of calcium carbonate and other minerals. ... (09 Oct 1997) ...
Found on http://www.encyclo.co.uk/local/20973

hardness

(from the article `radiation`) 4. Hardness and ductility depend on perfection of the crystal structure. It is thus found that irradiation results in a loss of ductility and an ... The hardness of a metal can be measured in several ways. If a hard indenter (a sphere, cone, or pyramid) is pushed a short distance into a metal with ... [...
Found on http://www.britannica.com/eb/a-z/h/16

Hardness

1 (mineralogy) The measure of the resistance of a mineral to scratching or abrasion. 2 (water) A property of water resulting from the presence of calcium carbonate and magnesium carbonate in solution.
Found on http://www.evcforum.net/WebPages/Glossary_Geology.html

Hardness

Hard'ness noun [ Anglo-Saxon 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...
Found on http://www.encyclo.co.uk/webster/H/14

hardness

a characteristic of water, imparted by salts of calcium, magnesium, and iron, such as bicarbonates, carbonates, sulfates, chlorides, and nitrates that cause curdling of soap, deposition of scale in boilers, damage in some industrial process, and sometimes
Found on http://www.chemicalglossary.net/definition/833-Hardness

hardness

a characteristic of water, imparted by salts of calcium, magnesium, and iron, such as bicarbonates, carbonates, sulfates, chlorides, and nitrates that cause curdling of soap, deposition of scale in boilers, damage in some industrial process, and sometimes objectionable taste. It may be determined by a standard laboratory procedure or computed from ...
Found on http://www.hach.com/chemGlossary

Hardness

A gemstone material's ability to resist scratching.
Found on http://www.encyclo.co.uk/local/22148

Hardness

A measure of a crystal or mineral to scratching or abrasion. (See Moh's Scale)
Found on https://www.encyclo.co.uk/local/20501

hardness

A property of wood that enables it to resist indentation. It is measure in kN and is often determined by the Janka hardness test
Found on http://www.encyclo.co.uk/local/21113

Hardness

A quality of stone determined by ASTM C241 test.
Found on http://www.selectstone.com/architectural-resources/stone-glossary/

Hardness

Degree of hardness. Shore and Rockwell being two scales used to measure and compare hardness.
Found on http://www.encyclo.co.uk/local/20829

Hardness

Hardness refers to the resistance of a smooth surface of a rock or mineral to scratching. It is determined by the binding force of atoms within the crystal structure and is measured according to Moh's ten division scale of hardness, ranging from 1 the softest, to 10 the hardest: 1) talc 2) gypsum 3) calcite 4) fluorite 5) apatite 6) orthoclase 7) q...
Found on http://www.probertencyclopaedia.com/browse/HH.HTM

hardness

hardness, property of matter commonly described as the resistance of a substance to being scratched by another substance. The degree of hardness is relative, different substances being compared with one another. Mohs's scale of hardness (named for Friedrich Mohs), used commonly in mineralogy, lists ...
Found on http://www.infoplease.com/ce6/sci/A0822704.html

Hardness

Is a measure of the resistance of a material to scratching and indention.
Found on http://www.areforum.org/up/GeneralStructures/JOIST%20AND%20STRUCTURAL%20GLO

hardness

Is the ability of a material to resist abrasion when a pointed fragment of another substance is drawn across it without sufficient pressure to develop cleavage.
Found on http://gemologyonline.com/gemology_dictionary.htm

Hardness

Measure of a material's resistance to localized Plastic Deformation. Most hardness tests involve indentation, but hardness may be reported as resistance to scratching (file test), or rebound of a projectile bounced off the material (scleroscope hardness). Some common measures of indentation hardness are Brinell Hardness Number, Rockwell Hardness Nu...
Found on http://www.instron.co.uk/wa/resourcecenter/glossary.xhtml

hardness

property of matter that determines how easily the substance can be scratched.
Found on http://www.mcwdn.org/chemist/chemglos.html

Hardness

Resistance of a material to indentation as measured by such methods as Brinell, Rockwell, and Vickers. The term hardness also refers to stiffness of a material, or its resistance to scratching, abrasion, or cutting.
Found on http://www.encyclo.co.uk/local/22067

hardness

Resistance of a mineral to scratching, determined on a comparative basis by the Mohs scale .
Found on https://www.encyclo.co.uk/local/22327

Hardness

Resistance of metal to plastic deformation usually by indentation. However, the term may also refer to stiffness or temper, or to resistance to scratching, abrasion, or cutting.Indentation hardness may be measured by various hardness tests, such as Brinnell, Rockwell, and Vickers.Many ceramics, and even glasses, are ductile under small indents, all...
Found on http://www.diracdelta.co.uk/science/source/h/a/hardness/source.html
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