NounPlural hardnesses hard ness (plural hardnesses)
From Wiktionary under the GNU Free Documentation License. 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 usage. In materials science, there are three principal operational definitions of hardness:
In physics, hardness encompasses:
The equation based definition of hardness is the pressure applied over the projected contact area between the indenter and the material being tested. As a result hardness values are typically reported in units of pressure, although this is only a "true" pressure if the indenter and surface interface is perfectly flat. From Wikipedia under the
GNU Free Documentation License What is the difference between hardness and brittleness? Q. What is the difference between hardness and brittleness, in Chemistry? Asked by GMHSMBGEEK129 - Thu Dec 17 21:16:59 2009 - - 1 Answers - 0 Comments A. Hardness is indicated by the ability of one solid to 'scratch another', as in geology, Moh's scale of hardness. Brittleness is indicated by the relative resistance of a solid to resist a blow, i.e., will it shatter upon impact? Answered by yohn - Thu Dec 17 21:26:50 2009 How do you measure the hardness of a rock? Q. Is there a tool or method for measuring the absolute hardness of a rock? Most hardness testers are for measuring metals and won't work on rocks (yes, I've tried). Thank you for your answer. Moh's scale is a relative hardness scale. I need an absolute hardness. Asked by L - Wed Dec 2 10:10:28 2009 - - 3 Answers - 0 Comments A. A rock is composed of one or minerals, and each mineral will have its own characteristic hardness which can be measured with the Mohs scale. Because a rock is usually composed of more than one mineral, the hardness will vary and therefore geologists generally do not measure the hardness of rocks. If you are looking for the strength of a rock for engineering or structural purposes, then you need to consider Rockwell scale or other tests prescribed by ASTM, but they become subjective when considering the inhomogenous nature of most rocks. Answered by georock1959 - Wed Dec 2 11:57:23 2009 Does atomic radius have anything to do with a metals density or hardness?
Q. Were learning about atomic radius in class, and I was wondering, if the atomic radius is smaller (meaning the distance for the nucleus to the outermost electron is short), would that have anything to do with the density or hardness of a metal? Asked by Goofer - Fri Sep 18 22:32:28 2009 - - 1 Answers - 0 Comments A. no not really, smallest radius (hydrogen) actually has little density and no hardness. The way a solid gets most of its density is in the lattice structure that the elements develop naturally. The structure has the largest effect on a systems properties Answered by dubby - Fri Sep 18 22:37:48 2009 From Yahoo Answer Search: "hardness"  news.google.com I-Newswire.com (press release) The ceramic knives manufactured by CeramiChef are known for incredible hardness of blade and exceptionally sharp edges. The knives are rust resistant and ... news.google.com urethanes-technology-international (subscription) Paint tests during Morthan's development included accelerated weathering, gravelometer, corrosion/salt spray, adhesion and hardness tests, among others. news.google.com Scotsman ... Gatland's counterproductive efforts to wind up the Irish ahead of last year's Grand Slam game, they have brought a streetwise mental hardness to Wales. ... and more » From Google News Search: "hardness"  web.umr.edu 399px x 290px | 29.40kB [source page] rockwell c 18 Dec 1997 15 50 steel hardness samples 1 jpg 18 Dec 1997 15 50 30K steel hardness samples 3 jpg 18 Dec 1997 15 50 29K steel hardness samples 4 jpg 18 Dec 1997 15 50 45K  info.lu.farmingdale.edu 1809px x 2439px | 687.70kB [source page] Rockwell Hardness Te > 08 Mar 2004 11 30 1k Hardness Test doc 08 Mar 2004 11 30 24k Hardness Assignment jpg 03 Apr 2004 13 24 688k Hardness Assign pdf 03 Apr 2004 13 24 140k From Yahoo Image Search: "hardness"  artikel-software.com admin Wed, 02 Jan 2008 14:57:48 GM File : pdf, 2.93 MB, 118 pages TOC 1. Introduction 1.1. IntroductionIntroduction 2. Rockwell . Hardness. Test 2.1 Significance of the test 2.2 Rockwell.  mipromdesign.com Tool shop Wed, 17 Feb 2010 04:57:39 GM Helps maintain proper calcium . hardness. level of 150-250 ppm One-Pound of GLB Calcium . Hardness. Increaser will increase the calcium . hardness. 10 ppm in 1000-Gallon of water Application: Determine calcium . hardness. level. ...  contour-pillow.com bierja Mon, 01 Mar 2010 04:20:33 GM Repivoting Clock and watches the removal of burrs and wear of the joints is often difficult because of its . hardness. ,especially in French clocks. Using a file of 600 m diamond needle can rotate smoothly in no time. ... From Google Blog Search: "hardness" |
