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 How to set hardness level in water softener? Q. I have a Northstar water softener and I would like to change the hardness setting to get my water a little softer. Right now the level is at 12 and I can't find out if that number needs to go higher or lower to make the water softer. Asked by ezgo4240 - Sat Jan 26 19:47:56 2008 - - 1 Answers - 0 Comments A. The water softener that I had couldn't make the water "softer". The hardness setting was used to tell the controller how often to recharge itself. I just did a quick web search for you & found some manuals on the Northstar site... Answered by roadrunnerjim - Sat Jan 26 20:01:39 2008 how can i reduce the hardness of my 10 gallon fish tank? Q. My water hardness is very hard but the rest is in normal ( amonia , nitrate etc...) Asked by crazymunky20 - Mon Jun 16 15:52:56 2008 - - 4 Answers - 0 Comments A. The only way to reduce the hardness for sure is to mix the water with reverse osmosis water, which has no minerals, its just pure water. A 50/50 mix of normal water and R/O water tends to do the trick for most people. To a lesser degree, Indian Almond Leaves, driftwood (especially mopani), blackwater extract, and aquarium peat will lower hardness. Remove anything that contains calcium, like shells, limestone, coral, etc. these release calcium ions which harden the water. Be aware that IAL, driftwood, etc. will cause your water to turn a tea color. That is because these are releasing a very natural, weak acid that gently lowers pH. If your pH is too high, these will not have much of an effect. Do not add any pH down. This is an acid.… [cont.] Answered by S H - Mon Jun 16 16:10:22 2008 What is a Brinell Hardness tester and a rockwell Hardness tester?
Q. these are used to measure the hardness of a metal description of the device. Asked by dc - Sat Jul 26 10:46:13 2008 - - 1 Answers - 0 Comments From Yahoo Answer Search: "hardness"  news.google.com Knoxville News Sentinel The USSSA is using a newly created, vice-like device that indicates the hardness of the bats. The machine, which costs $300, works by comparing the solidity ... news.google.com AFL If we come with the same intensity and match them for hardness like we did with Collingwood, but use our skills a bit better and our decision making, ... and more » news.google.com Optics.org This process generates a change in crystalline properties resulting in greater hardness compared with the bulk substrate. Case hardening is widely used with ... From Google News Search: "hardness"  freespaces.com 540px x 720px | 141.10kB [source page] Montgomery Tool Die Inspection Equipment Hardness Testers 2 Various Gauges From Yahoo Image Search: "hardness"  identi.ca Photoshop User Wed, 24 Jun 2009 15:00:46 GM Photoshop Tip of the Day: Change the . Hardness. of a Brush on the Fly -  zknives.com Gator Mon, 29 Jun 2009 07:37:08 GM Discussionon how important is theknife blade rockwell hadrdness.  swimming-pool-today.com admin Fri, 19 Jun 2009 14:11:36 GM Prevent corrosion of your pool plumbing caused by low pool chemical . hardness. levels. Use pool Calcium . Hardness. Increaser to correct pool chemical levels. Swimming pool chemicals at In The Swim. $55.99 | Water Balancing | Read more... From Google Blog Search: "hardness" |
