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Classification framework for scratch resistance
The Mohs scale (/moʊz/ MOHZ[citation needed]) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals
Mohs_scale
Measure of a material's resistance to localized plastic deformation
In materials science, hardness (antonym: softness) is a measure of the resistance to localized plastic deformation, such as an indentation (over an area)
Hardness
Water that has a high mineral content
content. It can pose critical problems in industrial settings, where water hardness is monitored to avoid problematic limescaling in boilers, cooling towers
Hard_water
Brinell scale of hardness
The Brinell hardness test (pronounced /brəˈnɛl/) measures the indentation hardness of materials. It determines hardness through the scale of penetration
Brinell_hardness_test
Hardness test
The Vickers hardness test was developed in 1921 by Robert L. Smith and George E. Sandland at Vickers Ltd as an alternative to the Brinell method to measure
Vickers_hardness_test
Hardness scale
The Rockwell hardness test is a hardness test based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter
Rockwell_hardness_test
Test to measure resistance of wood
The Janka hardness test (English: /ˈdʒæŋkə/; German: [ˈjaŋka]), created by Austrian-born American researcher Gabriel Janka (1864–1932), measures the resistance
Janka_hardness_test
Topics referred to by the same term
Hardness scales may refer to: Scratch hardness The Mohs scale of mineral hardness The Vickers hardness test The Brinell scale The Janka hardness test The
Hardness_scales
Patient-reported outcome for scoring erection hardness
The Erection Hardness Score (EHS) is a single-item Likert scale used to assess the subjective hardness of the penis as reported by the patient. It ranges
Erection_Hardness_Score
hardness of approximation is a field that studies the algorithmic complexity of finding near-optimal solutions to optimization problems. Hardness of
Hardness_of_approximation
Writing implement
were then fired in a kiln. By varying the ratio of graphite to clay, the hardness of the graphite rod could also be varied. This method of manufacture, which
Pencil
Hypothesis in computational complexity theory
In computational complexity theory, a computational hardness assumption is the hypothesis that a particular problem cannot be solved efficiently (where
Computational hardness assumption
Computational_hardness_assumption
engineering and metallurgy, hot hardness or red hardness (when a metal glows a dull red from the heat) corresponds to hardness of a material at high temperatures
Hot_hardness
Any measure of hardness based on scratch resistance
Scratch hardness refers to the hardness of a material in terms of resistance to scratches and abrasion by a harder material forcefully drawn over its
Scratch_hardness
Any measure of hardness based on indentation resistance
Indentation hardness tests are used in mechanical engineering to determine the hardness of a material to deformation. Several such tests exist, wherein
Indentation_hardness
Hardness-testing device
The Shore durometer is a device for measuring the hardness of a material, typically of polymers. Higher numbers on the scale indicate a greater resistance
Shore_durometer
Test for mechanical hardness
The Knoop hardness test /kəˈnuːp/ is a microhardness test – a test for mechanical hardness used particularly for very brittle materials or thin sheets
Knoop_hardness_test
Measure of water hardness
Carbonate hardness, is a measure of the water hardness caused by the presence of carbonate (CO2− 3) and bicarbonate (HCO− 3) anions. Carbonate hardness is usually
Carbonate_hardness
Form of carbon
it at a negligible rate under those conditions. Diamond has the highest hardness and thermal conductivity of any natural material, properties that are used
Diamond
A roll hardness tester is a device to measure the roll hardness, hardness profile and hardness variation of paper rolls. In the preparation phase, the
Roll_hardness_tester
Oxide mineral
(ruby-sapphire) (appearing in Sanskrit as kuruvinda). Because of corundum's hardness (pure corundum is defined to have 9.0 on the Mohs scale), it can scratch
Corundum
The Barcol hardness test characterizes the indentation hardness of materials through the depth of penetration of an indentor, loaded on a material sample
Barcol_hardness_test
Tablet hardness testing is a laboratory technique used by the pharmaceutical industry to determine the breaking point and structural integrity of a tablet
Tablet_hardness_testing
Unit of water hardness
Degrees of general hardness (dGH or °GH) is a unit of water hardness, specifically of general hardness. General hardness is a measure of the concentration
DGH
Topics referred to by the same term
dictionary. Hard means something that is difficult to do. It may also refer to: Hardness, resistance of physical materials to deformation or fracture Hard water
Hard
Main battle tank family of German origin
The Kampfpanzer Leopard, subsequently Leopard 1 following the introduction of the successive Leopard 2, is a main battle tank designed by Porsche, and
Leopard_1
High carbon steel
cooled, which is the tempering phase. The hardness of abrasion resistant steel is determined by a Brinell hardness test. This test uses a small steel ball
Abrasion_resistant_steel
Complexity class
In computational complexity theory, a computational problem H is called NP-hard if, for every problem L which can be solved in non-deterministic polynomial-time
NP-hardness
Process of heat treating used to increase the toughness of iron-based alloys
iron, to achieve greater toughness by decreasing the hardness of the alloy. The reduction in hardness is usually accompanied by an increase in ductility
Tempering_(metallurgy)
Calcium carbonate mineral
component of limestone. Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison. Large calcite crystals are
Calcite
Soft calcium sulfate mineral
[citation needed] The Mohs scale of mineral hardness defines gypsum as hardness value 2 based on scratch hardness comparison. Fine-grained white or lightly
Gypsum
The Meyer hardness test is a hardness test based upon projected area of an impression. The hardness, H {\displaystyle H} , is defined as the maximum load
Meyer_hardness_test
1977 studio album by Slave
The Hardness of the World is the second album by the American funk band Slave, released in 1977, their second album release that year. The lead single
The_Hardness_of_the_World
Material with Vickers hardness exceeding 40 gigapascals
superhard material is a material with a hardness value exceeding 40 gigapascals (GPa) when measured by the Vickers hardness test. They are virtually incompressible
Superhard_material
Crystalline chemical element or compound formed by geologic processes
species usually includes its common physical properties such as habit, hardness, lustre, diaphaneity, colour, streak, tenacity, cleavage, fracture, system
Mineral
Degrees of German carbonate hardness (°dKH or °KH; the dKH is from the German deutsche Karbonathärte) is a unit of water hardness, specifically for temporary
DKH
Standard hardness conversion table
Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness" (2019) Hardness Conversion Table – Brinell
Hardness_comparison
Hardness can vary by several hundred percent depending on the pretreatment, see e.g. Iron#Mechanical properties and Angelo Basile; Fausto Gallucci (2011)
Hardnesses of the elements (data page)
Hardnesses_of_the_elements_(data_page)
Type of metamorphic rock
impurities are redistributed and recrystallized during metamorphism. Due to its hardness, durability and resistance to temperature, marble is often used in sculpture
Marble
Silicon carbide mineral
moissanite is useful for commercial and industrial applications due to its hardness, optical properties, and thermal conductivity. The mineral moissanite was
Moissanite
Subgenre of rock music
Neue Deutsche Härte (German: [ˈnɔʏə ˈdɔʏtʃə ˈhɛʁtə]; lit. "New German Hardness", sometimes abbreviated as NDH), also known as dance-metal, is a crossover
Neue_Deutsche_Härte
Chemical compound
Rhenium diboride (ReB2) is a synthetic high-hardness material that was first made in 1962. The compound is formed from a mixture of rhenium, noted for
Rhenium_diboride
Chemical theory about acids and bases
relative ordering of ligands and transition metal ions in terms of their hardness and softness. HSAB theory is also useful in predicting the products of
HSAB_theory
Subset of tool steels
steels can withstand higher temperatures without losing their temper (hardness), allowing use of faster cutting speeds. At room temperature, in their
High-speed_steel
Cryptographic primitives that involve lattices
lattice-based cryptographic construction whose security could be based on the hardness of well-studied lattice problems, and Cynthia Dwork showed that a certain
Lattice-based_cryptography
Town in Devon, England
was used as an unofficial footpath linking Clifton, to the south, with Hardness, to the north. Before this it was necessary to go westwards to the head
Dartmouth,_Devon
Iron-carbon alloy
bulk hardness of the cast iron simply by virtue of their own very high hardness and their substantial volume fraction, such that the bulk hardness can
Cast_iron
Chemical compound
used as feedstock to produce aluminium metal, as an abrasive owing to its hardness, and as a refractory material owing to its high melting point. Corundum
Aluminium_oxide
Mineral made of silicon and oxygen
defining the value of 7 on the Mohs scale of hardness, a qualitative scratch method for determining the hardness of a material. The word quartz is derived
Quartz
American actor (1916–2003)
Gregory Peck.... Peck does an extraordinarily able job in revealing the hardness and the softness of a general exposed to peril." Film historian Peter von
Gregory_Peck
Phyllosilicate mineral in the pyrophyllite-talc group
platy form. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 1 as the hardness of talc, the softest mineral. When
Talc
Chemical compound of hydrogen and oxygen
safety of food, but also the preservation and shelf life of food. Water hardness is also a critical factor in food processing and may be altered or treated
Water
Making devices resist ionizing radiation
radiation-hardened versions (RadHard). While SOI eliminates latchup events, TID and SEE hardness are not guaranteed to be improved. Choosing a substrate with wide band
Radiation_hardening
Hexagonal lattice allotrope of carbon
natural specimens exhibited somewhat lower hardness through a large range of values (from 7–8 on Mohs hardness scale). The cause is speculated to be due
Lonsdaleite
Mineral form of calcium fluoride
isometric forms are not uncommon. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 4 as fluorite. Pure fluorite is
Fluorite
Steel in which the main interstitial alloying constituent is carbon
suitable for welding, but can be heat treated to improve its strength, hardness, and durability. Carbon steel is susceptible to rust and corrosion, especially
Carbon_steel
Mineral, quartz variety
structure is quite rigid and results in quartz's hardness and resistance to weathering. The hardness of the mineral is the same as quartz, thus making
Amethyst
Chemical element with atomic number 74 (W)
tungsten arc welding, superalloys, and radiation shielding. Tungsten's hardness and high density make it suitable for military applications in penetrating
Tungsten
British–Australian singer (1948–2022)
Angeles Times offers a counterpoint on her career decline in the mid-1980s: "Hardness never was Newton-John's comfort zone, though, and the 1980s were a much
Olivia_Newton-John
Transparent, yellow variety of quartz
visually, but they differ in hardness. All quartz varieties have a hardness of 7 on the Mohs scale, while topaz has a hardness of 8. Citrine can also be
Citrine
Blue-colored variant of a diamond
blue color in the stone. The Mohs hardness of a blue diamond is around the same as a regular diamond, with a hardness of 10. They are colored blue by trace
Blue_diamond
Materials used in cutting tools
Their hardness is sufficient to machine other steels. Carbon tool steels: They lose their hardness at 200 °C High speed steels: They lose their hardness at
Cutting_tool_material
Tabular arrangement of the chemical elements
"Should negative electron affinities be used for evaluating the chemical hardness?". Physical Chemistry Chemical Physics. 13 (6): 2285–2293. doi:10.1039/C0CP01785J
Periodic_table
Partial or complete separation of a body or system into two or more parts
However, any sufficiently sharp object is capable of cutting if it has a hardness sufficiently greater than the object being cut, and if it is applied with
Cutting
Partial or total inability to hear
Wikimedia Commons has media related to Audiology. Hearing loss is either a partial inability to hear, or a total inability termed deafness. Hearing loss
Hearing_loss
Red mercury(II) sulfide mineral, HgS
exhibits birefringence. Cinnabar has a mean refractive index near 3.2, a hardness between 2.0 and 2.5, and a specific gravity of approximately 8.1. The color
Cinnabar
Class of amorphous carbon material
bandgap range of 1.5 to 2.2 eV. The material demonstrated a hardness of 113 GPa on a Vickers hardness test vs diamonds rate at around 70 to 100 GPa. It was
Diamond-like_carbon
Method of testing metal hardness
The Leeb Rebound Hardness Test (LRHT) invented by Swiss company Proceq SA is one of the four most used methods for testing metal hardness. This portable
Leeb_rebound_hardness_test
Gemstone that has been shaped and polished
for transparent stones. Hardness is also taken into account as softer gemstones with a hardness lower than 7 on the Mohs hardness scale are easily scratched
Cabochon
Graph whose nodes are one of the vertex sets of a bipartite graph
In graph theory, the bipartite half or half-square of a bipartite graph G = (U,V,E) is a graph whose vertex set is one of the two sides of the bipartition
Bipartite_half
Chemical element with atomic number 76 (Os)
electrical contacts, and other applications that require extreme durability and hardness. Osmium is a hard, brittle, blue-gray metal, and the densest stable element—about
Osmium
Optimization problem in mathematics
In mathematical optimization, a quadratically constrained quadratic program (QCQP) is an optimization problem in which both the objective function and
Quadratically constrained quadratic program
Quadratically_constrained_quadratic_program
Type of armour
The typical Brinell Hardness range of MIL-A 12560 is 302-400 The MIL-12560K standard actually specifies four classes of hardnesses. The softest class I
Rolled_homogeneous_armour
Brand of polymer-framed semi-automatic pistols
process produces a matte gray-colored, nonglare surface with a 64 Rockwell C hardness rating and a 99% resistance to salt water corrosion (which meets or exceeds
Glock
Full-contact hybrid martial art and combat sport
Kickboxing A kickboxing match Focus punching, kicking, striking Hardness Full-contact Country of origin Ancient history, prehistoric Famous practitioners
Kickboxing
Ball used in cue sports
specific game being played. Various particular ball properties such as hardness, friction coefficient, and resilience are important to accuracy. Early
Billiard_ball
Swedish metallurgist (1849–1925)
creator of a method for quantifying the surface hardness of materials, now known as the Brinell hardness test. His name is also commemorated in the description
Johan_August_Brinell
A Persoz pendulum is a device used for measuring hardness of materials. The instrument consists of a pendulum which is free to swing on two balls resting
Persoz_pendulum
Cubic crystalline form of zirconium dioxide
has no cleavage and exhibits a conchoidal fracture. Because of its high hardness, it is generally considered brittle. Under shortwave UV cubic zirconia
Cubic_zirconia
Chemical element with atomic number 24 (Cr)
transition metal. Chromium is valued for its high corrosion resistance and hardness. A major development in steel production was the discovery that steel could
Chromium
Chatoyant gemstone from the quartz family
General Category Minerals Formula Silica (SiO2) Identification Colour golden to red-brown Mohs scale hardness 6.5–7 Luster Silky Specific gravity 2.64–2.71
Tiger's_eye
Alloys with high proportions of several metals
Al1.3 film reached a maximum hardness of 8.74 GPa. As a result, the structural transition from FCC to BCC led to hardness enhancements with the increasing
High-entropy_alloy
Soft bag of ornamental material filled with soft material
fragments. It may be used for sitting or kneeling upon, or to soften the hardness or angularity of a chair or couch. Decorative cushions often have a patterned
Cushion
Type of exercise equipment
bag is usually cylindrical and filled with various materials of suitable hardness. Punching bags have been used in martial arts and swordplay for the entire
Punching_bag
Mathematical problem in cryptography
worst-case lattice problems. Subsequently, the LWE problem has been used as a hardness assumption to create public-key cryptosystems, such as the ring learning
Learning_with_errors
Pencil with a replaceable lead
retracted inwards. Higher-end mechanical pencils often feature a lead hardness grade indicator and sometimes feature a retractable lead guide pipe. This
Mechanical_pencil
Memory-hard proof-of-work algorithm
Equihash is a memory-hard Proof-of-work algorithm introduced by the University of Luxembourg's Interdisciplinary Centre for Security, Reliability and Trust
Equihash
Hardness scale in mineralogy
The Rosiwal scale is a hardness scale in mineralogy, with its name given in memory of the Austrian geologist August Karl Rosiwal. The Rosiwal scale attempts
Rosiwal_scale
Type of heavy and hard wood
the Janka scale of hardness, which measures hardness of woods, lignum vitae ranks highest of the trade woods, with a Janka hardness of 4,390 lbf (19,500 N)
Lignum_vitae
Phyllosilicate mineral
Chrysocolla has a cyan (blue-green) color and is a minor ore of copper, having a hardness of 2.5 to 7.0. It is of secondary origin and forms in the oxidation zones
Chrysocolla
The intersection non-emptiness problem, also known as finite automaton intersection problem or the non-emptiness of intersection problem, is a PSPACE-complete
Intersection non-emptiness problem
Intersection_non-emptiness_problem
Khan of the Mongol Empire from 1206 to 1227
suggests that the word "Genghis" bears connotations of strength, firmness, hardness, or righteousness. A third hypothesis proposes that the title is related
Genghis_Khan
Determination of the softening point for materials that have no definite melting point
Vicat softening temperature or Vicat hardness is the determination of the softening point for materials that have no definite melting point, such as plastics
Vicat_softening_point
Silicate mineral
Lower quality topaz is commonly used as an abrasive material due to its hardness and it is used to produce refractory materials for high temperature environments
Topaz
Process of heating something to alter it
hardness either a range should be given or the minimum hardness specified. If a range is specified at least 5 points should be given. Only hardness is
Heat_treating
Team sport played with a bat and ball
behind the batter) and the batters wear protective gear because of the hardness of the ball, which can be delivered at speeds of more than 145 kilometres
Cricket
Variety of corundum, mineral, gemstone
which sold for US$34.8 million. Rubies have a hardness of 9.0 on the Mohs scale of mineral hardness. Among the natural gems, only moissanite and diamond
Ruby
Impure form of polycrystalline diamond
texture makes it more durable than a monocrystalline diamond. It is the same hardness as other types of diamond, but it is much tougher. Its polycrystalline
Carbonado
Gemstone variety of chalcedony
cap. As with all forms of chalcedony, chrysoprase has a hardness of 6 to 7 on the Mohs hardness scale and a conchoidal fracture like flint. The best known
Chrysoprase
Computational property
reduction is more restrictive than the usual poly-time reduction used for NP-hardness proofs. In particular, the pseudo-polynomial reduction cannot output a
Strong_NP-completeness
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