Mohs' scratch hardness

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• scratch hardness — resistance of a material, as a stone or metal, to scratching by one of several other materials, the known hardnesses of which are assembled into a standard scale, as the Mohs scale of minerals. [1925 30] * * * …   Universalium

• scratch hardness — resistance of a material, as a stone or metal, to scratching by one of several other materials, the known hardnesses of which are assembled into a standard scale, as the Mohs scale of minerals. [1925 30] …   Useful english dictionary

• Mohs scale of mineral hardness — The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and… …   Wikipedia

• Hardness — This article is about mechanical properties of materials. For other uses, see Hard. Hardness is the measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied. Macroscopic hardness is generally… …   Wikipedia

• Mohs hardness — Rough measure of the resistance of a smooth surface to scratching or abrasion, expressed in terms of a scale devised by German mineralogist Friedrich Mohs in 1812. Minerals are ranked in comparison with the Mohs scale, which is made up of 10… …   Universalium

• mohs' scale — ˈmōz , ōs(ə̇z) noun Usage: usually capitalized M Etymology: after Friedrich Mohs died 1839 German mineralogist 1. : a scale of hardness for minerals ranging from 1 for the softest to 10 for the hardest in which 1 represents the hardness of talc;… …   Useful english dictionary

• Mohs scale — noun a scale of hardness of solids; talc is 0 and diamond is 10; ordering is determined by which substance can scratch another substance • Hypernyms: ↑scale, ↑scale of measurement, ↑graduated table, ↑ordered series * * * /mohz/ a scale of… …   Useful english dictionary

• Mohs , Friedrich — (1773–1839) German mineralogist Mohs was born at Gernrode in Saxony and studied at Halle and at the Freiberg Mining Academy under Abraham Werner. In 1812 he became curator of the mineral collection at the Johanneum in Graz. He succeeded Werner at …   Scientists

• hardness — /hahrd nis/, n. 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, esp. calcium… …   Universalium

• Mohs hardness scale —    a 1 10 scale for estimating the hardness of a mineral, introduced by the German geologist Friedrich Mohs (1773 1839) in 1812. To apply the scale, one attempts to scratch the mineral with standard minerals assigned hardness numbers as follows:… …   Dictionary of units of measurement

• hardness —    a measure of the hardness of a metal or mineral. Hardness is a property easy to appreciate but difficult to quantify and measure.    The Mohs hardness scale is used in geology to give a rough estimate of hardness by testing which minerals are… …   Dictionary of units of measurement