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*  Operational definition - Wikipedia
Mechanical hardness[edit]. Unlike temperature and electric current, there is no abstract physical concept of the hardness of a ... Rebound, or dynamic, hardness measured with a Shore scleroscope.. Of these, indentation hardness itself leads to many ... However, there is not always a simple relationship between the various hardness scales. Vickers and Rockwell hardness numbers ... Rockwell hardness test - using a diamond cone indenter.. In all these, a process is defined for loading the indenter, measuring ...
https://en.wikipedia.org/wiki/Operational
*  Hard and soft light - Wikipedia
Softness/hardness of various light sources[edit]. Most light sources have a non-negligible size and therefore exhibit the ... The hardness or softness of light depends mostly on the following two factors: *Distance. The closer the light source, the ...
https://en.wikipedia.org/wiki/Soft_light
*  Monazite - Wikipedia
It has a hardness of 5.0 to 5.5 on the Mohs scale of mineral hardness and is relatively dense, about 4.6 to 5.7 g/cm3. There ...
https://en.wikipedia.org/wiki/Monazite
*  Obsidian - Wikipedia
hardness. 5-6[1]. Luster. Vitreous. Specific gravity. c. 2.4[2]. Optical properties. Translucent. ...
https://en.wikipedia.org/wiki/Obsidian
*  Plagioclase - Wikipedia
hardness. 6 - 6.5. Luster. Vitreous. Streak. White. Diaphaneity. Transparent to translucent. Specific gravity. 2.62 (albite) to ...
https://en.wikipedia.org/wiki/Plagioclase_feldspar
*  Wolframite - Wikipedia
hardness. 4-4.5. Luster. Submetallic to resinous. Streak. Reddish brown. Diaphaneity. Opaque. ...
https://en.wikipedia.org/wiki/Wolframite
*  Sphalerite - Wikipedia
It has a yellow or light brown streak, a Mohs hardness of 3.5-4, and a specific gravity of 3.9-4.1. Some specimens have a red ...
https://en.wikipedia.org/wiki/Sphalerite
*  Pseudomalachite - Wikipedia
hardness. 4.5-5. Luster. Vitreous. Streak. Blue green, paler than the mineral. ...
https://en.wikipedia.org/wiki/Pseudomalachite
*  Diamond - Wikipedia
Hardness. The extreme hardness of diamond in certain orientations makes it useful in materials science, as in this pyramidal ... Diamond hardness depends on its purity, crystalline perfection and orientation: hardness is higher for flawless, pure crystals ... The hardness of diamond contributes to its suitability as a gemstone. Because it can only be scratched by other diamonds, it ... Their hardness is associated with the crystal growth form, which is single-stage crystal growth. Most other diamonds show more ...
https://en.wikipedia.org/wiki/Diamond_mining
*  Kickboxing - Wikipedia
Hardness. Full-contact. Country of origin. Japan. Creator. Osamu Noguchi[1]. Tatsuo Yamada. ...
https://en.wikipedia.org/wiki/Kickboxer
*  Moldavite - Wikipedia
... and reported Mohs hardness varies from 5.5[1] to 7.[2] Moldavite can be transparent or translucent with a mossy green color, ...
https://en.wikipedia.org/wiki/Moldavite
*  Die casting - Wikipedia
Hardness. Material. Hardness. Material. Hardness Cavity inserts. P20[note 1]. 290-330 HB. H13. 42-48 HRC. DIN 1.2367. 38-44 HRC ... Copper: high hardness; high corrosion resistance; highest mechanical properties of alloys die cast; excellent wear resistance; ... Die and component material and hardness for various cast metals Die component. Cast metal ...
https://en.wikipedia.org/wiki/Die_casting
*  Pyrrhotite - Wikipedia
hardness. 3.5 - 4.5. Luster. Metallic. Streak. Dark grey - black. Specific gravity. 4.58 - 4.65, average = 4.61. ...
https://en.wikipedia.org/wiki/Pyrrhotite
*  Quartz - Wikipedia
It is nearly impossible to differentiate between cut citrine and yellow topaz visually, but they differ in hardness. Brazil is ...
https://en.wikipedia.org/wiki/Rock_crystal
*  Sapphire - Wikipedia
Because of the remarkable hardness of sapphires - 9 on the Mohs scale (the third hardest mineral, after diamond at 10 and ... Sapphire optical windows can be polished to a wide range of surface finishes due to its crystal structure and its hardness. The ... Highly resistant to scratching and abrasion (9 on the Mohs scale of mineral hardness scale, the 3rd hardest natural substance ... and windows in grocery store barcode scanners since the material's exceptional hardness and toughness makes it very resistant ...
https://en.wikipedia.org/wiki/Sapphires
*  Carnelian - Wikipedia
Hardness Softer Harder and tougher Fracture Uneven, splintery and conchoidal Like carnelian, but duller and more hackly (having ...
https://en.wikipedia.org/wiki/Carnelian
*  Smoky quartz - Wikipedia
hardness. 7 - lower in impure varieties (defining mineral). Lustre. Vitreous - waxy to dull when massive. ...
https://en.wikipedia.org/wiki/Smoky_quartz
*  Suntukan - Wikipedia
Hardness. Varies. Country of origin. Philippines. Famous practitioners. Eduard Folayang, Gabriel "Flash" Elorde, Francisco " ...
https://en.wikipedia.org/wiki/Panantukan
*  Tai chi - Wikipedia
Hardness. Forms competition,. Light contact (pushing hands, no strikes),. Full contact (strikes, kicks, throws, etc.). ... The philosophy of tàijíquán is that, if one uses hardness to resist violent force, then both sides are certainly to be injured ...
https://en.wikipedia.org/wiki/T
*  Chromium - Wikipedia
Its Mohs hardness is 8.5, which means that it can scratch samples of quartz and topaz, but can be scratched by corundum. ... The relative high hardness and corrosion resistance of unalloyed chromium makes chrome a reliable metal for surface coating; it ... Chromium metal is of high value for its high corrosion resistance and hardness. A major development in steel production was the ...
https://en.wikipedia.org/wiki/Chromium
*  Thallium - Wikipedia
Mohs hardness. 1.2 Brinell hardness. 26.5-44.7 MPa CAS Number. 7440-28-0 ...
https://en.wikipedia.org/wiki/Thallium
*  Praseodymium - Wikipedia
It is a ductile metal with a hardness comparable to that of silver.[6] Its 59 electrons are arranged in the configuration [Xe] ...
https://en.wikipedia.org/wiki/Praseodymium
*  Prairie - Wikipedia
Leaf hardness *Sclerophyll, stiff leaves. *Orthophyll, hyptiophyll leaves. *Leaf form *Aciculifolious, needle-leaved ...
https://en.wikipedia.org/wiki/Prairies
*  Carbon - Wikipedia
Q-carbon is reported to exhibit ferromagetism, fluorescence, and a hardness superior to diamonds.[48] ... Industrial diamonds are valued mostly for their hardness and heat conductivity, with the gemological qualities of clarity and ...
https://en.wikipedia.org/wiki/Carbonaceous
*  Calcium - Wikipedia
Mohs hardness. 1.75 Brinell hardness. 170-416 MPa CAS Number. 7440-70-2 ...
https://en.wikipedia.org/wiki/Calcium