Look up: hardness

1. 
   Hardness
   Hardness refers to hardness is the resistance of a smooth surface to scratching. It's determined by the binding force of atoms within the crystal structure. Moh's scale of hardness: 1)talc 2)gypsum 3)calcite 4)flourite 5)apatite 6)orthoclase 7)quartz 8)topaz 9)corundum 10)diamond.
   Found on http://www.encyclo.co.uk/nol.php
   
   
2. 
   Hardness
   the measure of some materials' resistance to deformation by surface indentation or by abrasion.
   Found on http://www.tulane.edu/~bmitche/book/glos
   
   
3. 
   hardness
   [n] - the property of being rigid and resistant to pressure 2. [n] - the quality of being difficult to do
   Found on http://www.webdictionary.co.uk/definitio
   
   
4. 
   Hardness
   A measure of a crystal or mineral to scratching or abrasion. (See Moh's Scale)
   Found on http://www.quartznall.co.uk/glossery.htm
   
   
5. 
   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.
   Found on http://www.longcliffe.co.uk/products/glo
   
   
6. 
   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 Number, ASTM Hardness Number, Diamond Pyramid Impact Test Hardness Number, Durometer Hardness, Knoop Hardness, and Pfund Hardness. A table relating various types of hardness values of metals is given in ASTM E-140. Hardness often is a good indication of tensile and wear properties of a material.
   Found on http://www.instron.co.uk/wa/resourcecent
   
   
7. 
   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/sour
   
   
8. 
   hardness
   Hardness is the resistance of a material to deformation of an indenter of specific size and shape under known load. This definition applies to all types of hardness scales except Mohs scale, which is a based on the concept of scratch hardness and is used chiefly for minerals. The most generally used hardness scales are Brinell (for cast iron), Rock...
   Found on http://www.ktf-split.hr/periodni/en/abc/
   
   
9. 
   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/definiti
   
   
10. 
    Hardness
    the measure of some materials resistance to deformation by surface indentation or by abrasion.
    Found on http://www.chemicalglossary.net/definiti
    
    
11. 
    Hardness
    Degree of hardness. Shore and Rockwell being two scales used to measure and compare hardness.
    Found on http://www.britishprint.com/tw/glossary.
    
    
12. 
    hardness
    a general term that correlates with strength,rigidity and resistance to abrasion or penetration Category: Electrical engineering and energy • ability of a coating film to resist cutting,indentation or penetration by a hard object Category: Iron and steel industries • a property of wood that enables it to resist indentation,generally measured by the loading,applied at a stan...
    Found on http://www.mijnwoordenboek.nl/definition
    
    
13. 
    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 the surface of a body, determined by its capacity to scratch another, or be itself scratched; -- me ...
    Found on http://www.encyclo.co.uk/webster/H/14
    
    
14. 
    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.mondofacto.com/facts/dictiona
    
    
15. 
    Hardness
    `Hardness` refers to various properties of matter in the solid phase that give it high resistance to various kinds of shape change when force is applied. `Hard matter` is contrasted with soft matter. Macroscopic hardness is generally characterized by strong intermolecular bonds. However, the behavior of solid materials under force is complex, resulting in several different scientific definitions of what might be called `hardness` in everyday usa...
    Found on http://en.wikipedia.org/wiki/Hardness
    
    
16. 
    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
    
    
17. 
    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
    
    
18. 
    Hardness
    Resistance to plastic deformation by indentation, penetration, scratching or bending.
    Found on http://www.allmetalcorp.com/htm/pg8_8_00
    
    
19. 
    Hardness
    The property of metals and their alloys relating to strength, elasticity, and toughness and defined as the measurement of its resistance to indentation. Through-hardened parts are typically measured by the Rb, Rc or Brinell scales. Case-hardened parts usually have a hardness specified to a specific depth
    Found on http://www.industrialnut.com/glossary_of
    
    
20. 
    Hardness
    Is a measure of the resistance of a material to scratching and indention.
    Found on http://www.hancockjoist.com/glossary.htm
    
    
21. 
    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://oak.arch.utas.edu.au/glossary/vie
    
    
22. 
    Hardness
    the resistance of a substance to surface abrasion.
    Found on http://www.noria.com/dictionary/default.
    
    
23. 
    Hardness
    The hardness of a material can be measured by its resistance to scratching or to indentation. Mostly used hardness tests involve the determination of the material resistance to indentation under standardized conditions. A hard indenter of standard shape is pressed into the surface of the material under a specified load. The resulting area of indentation or the depth of indentation is measured and ...
    Found on http://www.blowmachines.com/glossary1.ht
    
    
24. 
    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/A08227