Degree+of+hardness
11hardness number — a number indicative of the degree of relative hardness of materials. See Brinell, Knoop, Rockwell, and Vickers hardness n …
12degree — noun 1》 the amount, level, or extent to which something happens or is present. 2》 a unit of measurement of angles, equivalent to one ninetieth of a right angle. (Symbol: °) 3》 a unit in any of various scales of temperature, intensity, or hardness …
13degree — 1) 1/360 of a circle or 60 minutes. The symbol here and below is ° 2) 60 nautical miles, 69.05 statute miles or 111.12 km 3) a temperature unit (Celsius or Fahrenheit). Strictly 10°C is an actual temperature while 10C° is a range (from say 23 to… …
14Indentation hardness — tests are used to determine the hardness of a material to deformation. Several such tests exist, wherein the examined material is indented until an impression is formed; these tests can be performed on a macroscopic or microscopic scale. When… …
15Vickers hardness test — A Vickers hardness tester The Vickers hardness test was developed in 1924 by Smith and Sandland at Vickers Ltd as an alternative to the Brinell method to measure the hardness of materials.[1] The Vickers test is often easier to use than other… …
16Rockwell hardness — A measurement of the degree of hardness of a given substance …
17degrees of water hardness — dGH (water hardness expressed in degrees of hardness. 0 4 is very soft, 5 8 soft, up to 30 which is extremely hard water). Note that different countries use different measures: 1 English (Clark) degree is 14.3 p.p.m. calcium carbonate, 1 American …
18water hardness — the concentration of calcium and magnesium ions in water expressed as p.p.m. or mg/l of calcium carbonate equivalents. Water hardness expressed in degrees of hardness. 0 4 is very soft, 5 8 soft, up to 30 which is extremely hard water. Note that… …
19Barcol hardness test — The Barcol hardness test characterizes the indentation hardness of materials through the depth of penetration of an indentor, loaded on a material sample and compared to the penetration in a reference material. The method is most often used for… …
20Carbonate hardness — is the measure of Calcium and Magnesium and other hard ions associated with carbonate (CO32 ) and bicarbonate (HCO3 ) ions contained in a solution, usually water. It is usually expressed either as parts per million (ppm or mg/L), or in degrees… …
