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Topics related to "Mohs Scale"

scale insect
scale insect common name for members of a highly modified group of insects belonging to several families of the superfamily Coccoidea. Scales possess antennae and are characterized by reduced legs. Only the males have wings; females are always wingless. Scales are popularly subdivided into three gr... Read more
Mercalli scale
Mercalli scale An earthquake-intensity scale based on direct observation. Devised by G.Mercalli, it ranges from scales I (not felt) and II (felt by most people at rest) to VII (difficult for a person to remain standing), X (most structures destroyed), and XII (total devastation). It is not a reliab... Read more
Celsius temperature scale
Celsius temperature scale , temperature scale according to which the temperature difference between the reference temperatures of the freezing and boiling points of water is divided into 100 degrees. The freezing point is taken as 0 degrees Celsius and the boiling point as 100 degrees Celsius. The... Read more
quadrant
quadrant in technology, angle-measuring device based on a scale of 90°. It is sometimes confused with the sextant , a similar instrument based on a scale of 60°. The quadrant is rarely used today. ... Read more
scale
scale in zoology, an outgrowth, either bony or horny, of the skin of an animal. The major component of the scales of fishes is bone, and they are formed directly in the skin membrane as the fish grows. The number of rows of scales, as well as the kind, figures in the identification of a species. Th... Read more
Fahrenheit temperature scale
Fahrenheit temperature scale , temperature scale in which the temperature difference between two reference temperatures, the melting and boiling points of water, is divided into 180 equal intervals called degrees. The freezing point is taken as 32°F and the boiling point as 212°F. The scal... Read more
kelvin
kelvin abbr. K, official name in the International System of Units (SI) for the degree of temperature as measured on the Kelvin temperature scale . ... Read more
Beaufort scale
Beaufort scale a scale of wind velocity devised (c.1805) by Admiral Sir Francis Beaufort of the British navy. An adaptation of Beaufort's scale is used by the U.S. National Weather Service; it employs a scale from 0 to 12, representing calm, light air, light breeze, gentle breeze, moderate breeze... Read more
hardness
hardness property of matter commonly described as the resistance of a substance to being scratched by another substance. The degree of hardness is relative, different substances being compared with one another. Mohs's scale of hardness (named for Friedrich Mohs), used commonly in mineralogy, lists ... Read more
Kelvin temperature scale
Kelvin temperature scale a temperature scale having an absolute zero below which temperatures do not exist. Absolute zero , or 0°K, is the temperature at which molecular energy is a minimum, and it corresponds to a temperature of -273.15° on the Celsius temperature scale . The Kelvin ... Read more

Encyclopedia entries related to "Mohs Scale"

Mohs’ Scale
Encyclopedia entry from: The Gale Encyclopedia of Science Mohs ’ Scale Mohs ’ scale, sometimes also called Mohs ’ hardness scale or Mohs ’ scale of mineral hardness, provides an index and relative measure of mineral hardness (i.e., resistance to abrasion...
Mohs' scale of mineral hardness
Book article from: The Oxford Companion to the Earth Mohs' scale of mineral hardness The hardness of a...hardness based on fairly common minerals (Mohs' scale). The 10-point scale is: 1, talc...topaz, 175; and gypsum, 1.25.) On Mohs' scale a finger nail is 2.5; a copper coin...
Mohs' scale of hardness
Book article from: World Encyclopedia Mohs' scale of hardness The scale is not regular. Diamond, the hardest known natural substance, is 90 times harder than corundum. Mineral Hardness Simple hardness test Talc 1.0 Crushed by fingernail Gypsum 2.0 Scratched by fingernail Calcite...
Abrasives
Encyclopedia entry from: UXL Encyclopedia of Science ...are also used now as abrasives. Mohs scale A material can serve as an abrasive...of a material's hardness is the Mohs scale. This 0-to-10 scale was named...1839). Any object listed on the Mohs scale can be used as an abrasive for any...
Mineralogy
Encyclopedia entry from: The Gale Encyclopedia of Science ...hard. The hardness is then measured on a scale of 1-10, called Mohs ’ hardness scale, named after the Austrian scientist F. Mohs...sophisticated tests are available, but the Mohs scale remains useful because it can be used in the...
hardness
Book article from: World Encyclopedia ...Resistance of a material to abrasion, cutting, or indentation. The Mohs' scale is a means of expressing the comparative hardness of materials, particularly...scratched by material 5, would be rated as having hardness 4 on the Mohs' scale.
Lithium
Encyclopedia entry from: The Gale Encyclopedia of Science ...solid at room temperature. Lithium is extraordinarily soft for a metal with a rating of 0.6 on the Mohs scale, softer even than talc, whose Mohs rating is 1. Lithium is an active metal, although, as one would predict from its placement in the...
gemstones
Book article from: The Oxford Companion to the Earth ...chemical attack and the abrasion of everyday use is essential for gemstones used in jewellery. When measured on Mohs' scale of hardness (a scale of ten points from the softest, talc (1), to the hardest, diamond (10) ), most gemstones...
Minerals
Encyclopedia entry from: UXL Encyclopedia of Science ...ability to scratch another mineral. This is usually measured using a comparative scale devised in 1822 by German mineralogist Friedrich Mohs. The Mohs hardness scale lists 10 common minerals, assigning to each a hardness from 1 (talc) to 10...
sulphate minerals
Book article from: The Oxford Companion to the Earth ...cause the heaving of floors in buildings. Gypsum of the variety known as selenite is monoclinic; its hardness is 2 on Mohs scale and it has one perfect cleavage yielding flexible but not elastic laminae; other, rarer cleavages may result in rhombohedral...

Dictionary entries related to "Mohs Scale"

Mohs's scale of hardness
Book article from: A Dictionary of Earth Sciences Mohs's scale of hardness Scale, devised in 1812 by the German mineralogist Friedrich Mohs , of the scratch hardness of minerals , as: 1 talc ; 2 gypsum ; 3 calcite...
Mohs, Friedrich
Dictionary entry from: Complete Dictionary of Scientific Biography ...this method more certain, Mohs proposed a scale of increasing hardness from...subsequently added to the Mohs scale. Mineralogists did not commonly...Mineral-Systems , in which the scale was prominently featured. Mohs remained at Graz until 1817...
hardness
Book article from: A Dictionary of Ecology ...useful tests for mineral identification. Mohs's scale of hardness (H), which ranks minerals...German-Austrian mineralogist Friedrich Mohs (1773–1839) and is still...scratch to within one or two points on Mohs's scale.
soapstone
Book article from: The Oxford Dictionary of Art ...jade in appearance but with a greasy, soapy feel. It is a compact form of talc, the softest standard mineral on the Mohs scale of hardness. Usually it is a dull greenish or bluish grey or sometimes brown. It will take a smooth polish, and is...
talc
Book article from: A Dictionary of Earth Sciences ...composition Mg 6 [Si 4 O 10 ] 2 (OH) 4 ; sp. gr. 2.58–2.83; hardness 1 (it has the lowest hardness on Mohs 's scale of hardness); monoclinic ; rare crystals are tabular , often massive ; white to green; cleavage perfect {001...
diamond
Book article from: A Dictionary of Earth Sciences diamond Crystalline form of carbon that is the hardest naturally occurring material ( hardness 10 on Mohs's scale); sp. gr. 3.5; cubic ; white or colourless, sometimes yellow, green, red, and rarely blue or black; crystals octahedral...

Related newspaper, magazine, and trade journal articles from HighBeam Research

Exploring the Relationship of Scratch Resistance, Hardness, and other Physical Properties of Minerals using Mohs Scale Minerals
Magazine article from: Journal of Geoscience Education; 1/1/2007; ; 700+ words ; ABSTRACT The Mohs scale is enshrined in geoscience curricula...systematic measurements of the hardness of Mohs scale minerals using indentation techniques...differences in hardness among minerals of the Mohs scale, enhancing their understanding of the...
High School Students' Mnemonic Devices for Mohs Hardness Scale
Magazine article from: Journal of Geoscience Education; 1/1/2006; ; 700+ words ; ...poetry couplets for minerals on the Mohs scale of hardness. Students' products...science students who practiced the Mohs scale of hardness by creating mnemonic...Mnemonic Device Applied to Learning the Mohs Scale of Hardness" (Rule, 2003). In...
The Rhyming Peg Mnemonic Device Applied to Learning the Mohs Scale of Hardness
Magazine article from: Journal of Geoscience Education; 11/1/2003; ; 700+ words ; ...MNEMONIC DEVICE APPLIED TO LEARNING THE MOHS SCALE OF HARDNESS A mnemonic device is...information using the example of the Mohs scale for determining mineral scratch...properties in mineral identification. MOHS SCALE OF HARDNESS The hardness of a mineral...
Mohs surgery for Bowen's disease?
Magazine article from: Dermatology Times; 2/1/2006; ; 700+ words ; ...fluorouracil and imiquimod. Mohs micrographie surgery would probably...than 5 percent by performing Mohs micrographie surgery on all...fairly low on most people's scale of seriousness. Thus, less involved therapies are indicated. Mohs micrographie surgery is a terrific...
Weaker lidocaine provides equal pain relief for Mohs.(Cutaneous Oncology)
Magazine article from: Skin & Allergy News; 8/1/2008; ; 700+ words ; ...study, patients undergoing Mohs surgery were randomly assigned...infiltrated immediately before each Mohs layer and the reconstruction...administered (including all stages of Mohs surgery and the reconstruction...with a 100-ram visual analog scale and objectively according to...
Nodular basal cell carcinoma appearing as morpheaform during Mohs micrographic surgery.(CASE REPORTS)(Case study)(Clinical report)
Magazine article from: Journal of Drugs in Dermatology; 2/1/2009; ; 700+ words ; ...with curettage and electrodesiccation, Mohs micrographic surgery (MMS) would be warranted...generalized erythema with greasy white-yellow scale along the eyebrows approaching the glabella...consistent with seborrheic dermatitis. Mohs micrographic surgery was performed on both...
Mohs woes
Magazine article from: Dermatology Times; 1/1/2008; ; 700+ words ; ...The problem is that the Mohs codes have been very carefully...reimbursed 50 percent for the second Mohs doesn't cover the cost of...Specialty Society Relative Value Scale Update Committee (RUC),hesays...the change could cut a typical Mohs surgeon's gross income by...
Act now to stop Mohs pay change, surgeons push.(News)
Magazine article from: Skin & Allergy News; 6/1/2007; ; 700+ words ; ...CMS allotted new CPT codes for Mohs surgery in 2007 (see box...the work relative values for Mohs declined, practice expense...Specialty Society Relative Value Scale Update Committee (RUC), which...voted not to include the new Mohs codes on the list. This decision...
Ongoing studies probe predictors of Mohs surgery outcomes
Magazine article from: Dermatology Times; 2/1/2002; ; 700+ words ; ...ago. Patients referred for Mohs surgery with a biopsy-confirmed...were removed with two or fewer Mohs stages and no one method of...comorbidity affects outcomes in Mohs surgery patients," Dr. Tull...patients with a stress index scale in order to determine how stress...
Skin substitute may improve post-Mohs appearance
Magazine article from: Dermatology Times; 2/1/2002; ; 700+ words ; ...Christophe Lapiere, M.D.a Mohs surgeon and assistant professor...Vancouver Burn Scar Assessment Scale. Cosmetic appearance was rated...patient using a visual analogue scale, and the patients were also...full-thickness wounds after Mohs micrographic or excisional surgery...