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Hardness - Wikipedia, the free encyclopedia 
 
en.wikipedia.org/wiki/Hardness
Hardness is a measure of how resistant solid matter is to various kinds of permanent shape change when a compressive force is applied. Some materials, such as metal, are harder than others.  
 
 
 
Hardness - Definition and More from the Free Merriam-Webster ... 
 
www.merriam-webster.com/dictionary/hardness
Full Definition of HARDNESS 1 : the quality or state of being hard 2 a : the cohesion of the particles on the surface of a mineral as determined by its capacity to scratch another or be itself scratched — compare mohs' scale b : resistance of metal to indentation under a static load or to ...  
 
 
 
Hardness | Define Hardness at Dictionary.com 
 
dictionary.reference.com/browse/hardness
noun 1. the state or quality of being hard: the hardness of ice. 2. a relative degree or extent of this quality: wood of a desirable hardness. 3. that quality in water that is imparted by the presence of dissolved salts, especially calcium sulfate or bicarbonate. 4. unfeelingness or jadedness; callo  
 
 
 
hardness - definition of hardness by The Free Dictionary 
 
www.thefreedictionary.com/hardness
hard·ness (härd′nĭs) n. 1. The quality or condition of being hard. 2. The relative resistance of a mineral to scratching, as measured by the Mohs scale.  
 
 
 
Scratch hardness - Wikipedia, the free encyclopedia 
 
en.wikipedia.org/wiki/Scratch_hardness
Scratch hardness tests are used to determine the hardness of a material to scratches and abrasion. The earliest test was developed by mineralogist Friedrich Mohs in 1820 (see Mohs scale). It is based on relative scratch hardness, with talc assigned a value of 1 and diamond assigned a value of 10 ...  
 
 
 
HARDNESS? - Amethyst Galleries' Mineral Gallery 
 
www.galleries.com/minerals/property/hardness.htm
A good property in mineral identification is one that does not vary from specimen to specimen. In terms of reliability, hardness is one of the better physical properties for minerals.  
 
 
 
Mineral Hardness - Mineralogy Database 
 
webmineral.com/help/Hardness.shtml
Definition . Hardness is measured by the resistance which a smooth surface offers to abrasion. The degree of hardness is determined by observing the comparative ease or difficulty which which one mineral is scratched by another.  
 
 
 
Hardness - Center for Advanced Life Cycle Engineering 
 
www.calce.umd.edu/TSFA/Hardness_ad_.htm
Basics of materials hardness and measuring methods explained in detail.  
 
 
 
Mohs Hardness Scale : Testing the Resistance to Being Scratched 
 
geology.com/minerals/mohs-hardness-scale.shtml
One of the most important tests for identifying mineral specimens is the Mohs Hardness Test. This test compares the resistance of a mineral to being scratched by ten reference minerals known as the Mohs Hardness Scale (see Table 1).  
 
 
 
Hardness - NDE/NDT Resource Center 
 
https://www.nde-ed.org/.../Materials/Mechanical/Hardness.htm...
Hardness. Hardness is the resistance of a material to localized deformation. The term can apply to deformation from indentation, scratching, cutting or bending.  
 
 
 
Hardness: Mineral Properties - The Mineral and Gemstone Kingdom 
 
www.minerals.net/resource/property/Hardness.aspx
Hardness plays a major role in identifying a mineral. It can make the identification process much simpler by considerably narrowing a search.  
 
 
 
hardness tester | eBay 
 
www.ebay.com/sch/i.html?_nkw=hardness+tester
Find great deals on eBay for hardness tester rockwell hardness tester. Shop with confidence.  
 
 
 
hardness | physics | Encyclopedia Britannica 
 
www.britannica.com/EBchecked/topic/255101
hardness, resistance of a mineral to scratching, described relative to a standard such as the Mohs hardness scale. Hardness is an important diagnostic property in mineral identification.  
 
 
 
USGS Water-Quality Information: Water Hardness and Alkalinity 
 
water.usgs.gov/owq/hardness-alkalinity.html
USGS Water-Quality Information - Water Hardness and Alkalinity; U.S. Geological Survey Office of Water Quality  
 
 
 
What is hardness? definition and meaning - BusinessDictionary.com 
 
www.businessdictionary.com/definition/hardness.html
1.Resistance of a material to deformation, indentation, or penetration by means such as abrasion, drilling, impact, scratching, and/or wear, measured by hardness tests such as Brinell, Knoop, Rockwell, or Vickers.  
 
 
 
Hardness - Mountain Empire Community College 
 
water.mecc.edu/exam_prep/hardness.html
The degree of hardness acceptable for a finished water varies with the consumer or industry served. In 1968, the American Water Works Association (AWWA) established a water quality goal for total hardness of 80 to 100 mg/l as calcium carbonate.  
 
 
 
Hardness Synonyms, Hardness Antonyms | Thesaurus.com 
 
www.thesaurus.com/browse/hardness
Synonyms for hardness at Thesaurus.com with free online thesaurus, antonyms, and definitions. Dictionary and Word of the Day.  
 
 
 
Hardness dictionary definition | hardness defined 
 
www.yourdictionary.com/hardness
You get used to knowing the different types of hardness and thickness. The hardness came back into his eyes and he looked away. His warm hands covered hers and she could feel the hardness of his chest muscles on her back as he guided her arms in a smooth swing.  
 
 
 
rockwell hardness tester | eBay 
 
www.ebay.com/sch/i.html?_nkw=rockwell+hardness+tester
Find great deals on eBay for rockwell hardness tester portable hardness tester. Shop with confidence.  
 
 
 
The Hardness of Minerals and Rocks - Bob's Rock Shop: Mineral ... 
 
www.rockhounds.com/rockshop/hardness1.html
By Dr. William S. Cordua, University of Wisconsin Dr Bill Cordua's Home Page Originally Published in Three Installments through the Lapidary Digest Mail List  
 
 
 
Mohs hardness | mineralogy | Encyclopedia Britannica 
 
www.britannica.com/EBchecked/topic/387714
Mohs hardness, rough measure of the resistance of a smooth surface to scratching or abrasion, expressed in terms of a scale devised (1812) by the German mineralogist Friedrich Mohs.  
 
 
 
Mineral Hardness | What is hardness - Kids Love Rocks | rocks ... 
 
www.kidsloverocks.com/html/mineral_hardness.html
Mineral Hardness . The hardness of a mineral is a way of describing how easy or difficult it is to scratch the mineral. It is used, in combination with the other physical properties, to help identify a mineral specimen.  
 
 
 
ROCK HARDNESS CLASSIFICATION - MOHS SCALE 
 
www.bestcrystals.com/hardness.html
Information about the Mohs Scale of Hardness for rock classification. The Mohs sacale consists of 10 classifications of hardness. Chart listing stones and property descriptions for each hardness classification.  
 
 
 
Explanation of Water Hardness 
 
www.fcwa.org/water/hardness.htm
Many industrial and domestic water users are concerned about the hardness of their water. Hard water requires more soap and synthetic detergents for home laundry and washing, and contributes to scaling in boilers and industrial equipment.  
 
 
 
Hardness Tester | Rockwell Hardness Tester | Brinell Hardness ... 
 
www.worldoftest.com/hardnesstester.htm
Hardness Tester Range - Qualitest offers more than 100 models of advanced portable and bench-top hardness testing equipment such as Rockwell hardness tester, Universal hardness testers, Brinell hardness testers, Vickers, Micro, Knoop hardness testers and hardness test blocks.  
 
 
 
Hardness, Brinell Hardness, HBW, HRB, HRC, Rockwell 22 RC, 99 ... 
 
www.woodcousa.com/Hardness-def.htm
Revised: 04/02/2014. Glossary Terms and Definitions Related to Hardness Click here to return to main Glossary Find numerical entries by alphabetical spelling.  
 
 
 
Material Hardness Review - Engineers Edge 
 
engineersedge.com/material_science/hardness.htm
Strength / Mechanics of Materials Table of Content. Material Hardness Review. Hardness is the property of a material that enables it to resist plastic deformation, penetration, indentation, and scratching.  
 
 
 
Mohs Scale of Hardness - Identify Rocks & Minerals 
 
chemistry.about.com/od/geochemistry/a/mohsscale.htm
The Mohs Scale of Hardness measures how well a substance resists scratching by another material. You can use this scale to test the hardness of rocks, minerals, and crystals, to help identify them.  
 
 
 
Mineral Hardness: Mohs Hardness Scale - All About Gemstones 
 
www.allaboutgemstones.com/mohs_hardness_scale.html
The True Hardness Scale compared to the Mohs Hardness Scale of gem and mineral hardness.  
 
 
 
Amazon.com: rockwell hardness tester 
 
www.amazon.com/s?ie=UTF8&page=1&rh=i%3Aaps%2Ck%3A......
Product Description... HFS New Rockwell Hardness Tester Machine 150KFG Accessories Hard Metal ...  
 
 
 
Mohs Scale of Hardness - Mineralogical Society of America ... 
 
www.minsocam.org/MSA/collectors_corner/article/mohs.htm
The Mohs' hardness scale was developed in 1822 by Frederich Mohs. This scale is a chart of relative hardness of the various minerals (1 - softest to 10 - hardest).  
 
 
 
WATER HARDNESS -- CALCIUM & MAGNESIUM 
 
www2.ca.uky.edu/wkrec/HARDNESS.htm
Water hardness is important to fish culture and is a commonly reported aspect of water quality. It is a measure of the quantity of divalent ions (for this discussion, salts with two positive charges) such as calcium, magnesium and/or iron in water.  
 
 
 
hardness - definition of hardness by Medical dictionary 
 
medical-dictionary.thefreedictionary.com/hardness
Definition of hardness in the Medical Dictionary. hardness explanation. Information about hardness in Free online English dictionary. What is hardness? Meaning of hardness medical term. What does hardness mean?  
 
 
 
The Hardness Factor | Men's Health 
 
www.menshealth.com/health/hardness-factor
When the penis is hard, life is good. When hardness diminishes, so does a man's health and his innate sense of who he is. No matter how talented a man may feel he is in bed, he defines his sex by his erection, by its strength and hardness.  
 
 
 
hardness definition of hardness in the Free Online Encyclopedia 
 
encyclopedia2.thefreedictionary.com/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.  
 
 
 
Lab 6: Hardness - Water/Wastewater Distance Learning at ... 
 
water.me.vccs.edu/courses/ENV211/lab6_print.htm
Since the hardness in water primarily originates from contact with the soil and with rock formations, hard waters tend to originate in areas where topsoil is thick and limestone formations are present.  
 
 
 
Hardness of Water - Pure Water Occasional 
 
www.purewateroccasional.net/wtihardness.html
Hardness in water is determined by the content of calcium and magnesium salts. These salts are formed when calcium and magnesium combine with bicarbonates, sulfates, chlorides, and nitrates.  
 
 
 
Hardwood Flooring Hardness Chart- Janka 
 
www.hardwoodinstaller.com/preparation/hardness.htm
Hardwood Flooring Hardness Chart. Having seen changes in the wood flooring business over the years, I never realized how many people were ill-advised of how to actually go about buying wood floors.  
 
 
 
Hardness | Mineralogy4Kids 
 
mineralogy4kids.org/mineral-properties/hardness
Mineral Properties. Home; Properties; Hardness; Hardness  
 
 
 
Hardness in water, USGS Water Science School 
 
water.usgs.gov/edu/hardness.html
The simple definition of water hardness is the amount of dissolved calcium and magnesium in the water. Hard water is high in dissolved minerals, both calcium and magnesium.  
 
 
 
Water Hardness - The Krib (Aquaria and Tropical Fish) 
 
www.thekrib.com/Plants/CO2/khgh.html
CO2, carbonate hardness, etc. by booth-at-hplvec.LVLD.HP.COM (George Booth) Date: Tue, 6 Apr 1993 This should make it to the FAQ sometime. Does this help?  
 
 
 
Janka Scale - Janka Hardness - Janka Lumber Scale 
 
www.advantagelumber.com/janka.htm
The Janka Hardness Test is a measure of the hardness of wood. The Janka Test was developed as a variation of the Brinell hardness test. The test measures the force required to push a steel ball with a diameter of 11.28 millimeters (0.444 inches) into the wood to a depth of half the ball’s ...    
 
 
portable hardness testers leeb ultrasonic 
 
https://leebhardnesstesters.com
Portable Hardness Testers - Direct import Big discounts on Leeb rebound type portable hardness testers and portable ultrasonic UCI hardness testers.  
 
 
 
Janka Hardness Chart | Hardwood Hardness Scale & Ratings ... 
 
www.stewartfloor.com/resources/janka-hardness-chart
The Janka hardness table shows you whether a certain type of wood is suitable for flooring. The Janka Hardness Test measures a wood's resistance to denting or crushing.  
 
 
 
What is Rubber Hardness? - O-Rings Inc 
 
www.oringsusa.com/html/durometer_of_o-rings.html
The hardness of rubber compounds is measured by the Shore A durometer; the higher the durometer, the harder the compound. 70-durometer hardness should be used whenever possible as it offers the best combination of properties for most O-Rings applications.  
 
 
 
Hardness (materials science) - definition of Hardness ... 
 
www.thefreedictionary.com/Hardness+(materials+science)
hard·ness (härd′nĭs) n. 1. The quality or condition of being hard. 2. The relative resistance of a mineral to scratching, as measured by the Mohs scale. 3. The relative resistance of a metal or other material to denting, scratching, or bending. hardness (ˈhɑːdnɪs) n 1. the quality or ...  
 
 
 
Hardness Testing - New Hampshire Materials Laboratory - Welcome 
 
nhml.com/hardness-testing.cfm
Hardness Testing. 7/1/2002 by Fred Hochgraf. Background. In metal working, hardness generally implies resistance to penetration. It may, however, include resistance to scratching, abrasion or cutting.  
 
 
 
Hardness Testers for Rockwell and Brinell | Newage Testing ... 
 
www.hardnesstesters.com
Experts in hardness testers and hardness test equipment including Rockwell, Brinell and microhardness testers, optical systems, software & durometers    
 
 
Rockwell hardness scales - Sizes - The Online Quantinary℠ 
 
sizes.com/units/hardness_rockwell.htm
A scale indicating the hardness of materials, first used in 1919, when it was invented by Stanley P. Rockwell. The measurement has no units. The symbol is HR followed by a letter indicating one of a number of possible scales, described in the table below.  
 
 
 
Amazon.com: water hardness tester 
 
www.amazon.com/...rh=i%3Aaps%2Ck%3Awater%20hardness%20tester...
Product Description... scale formation and cloudy water. Low hardness can leave water ...  
 
 
 


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