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measure of hardness

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  • 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

  • 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

  • hardness — the measure of a material s resistance to deformation by surface indentation or by abrasion. The most common method of measurement is Rockwell. Other methods are Brinell, Scleroscope, Tukon and Vickers. red hardness secondary hardness …   Mechanics glossary

  • measure and measurement —    See angstrom, Centigrade, centiliter, centimeter, circumference, cubic, diameter, dimension, direction, foot, gauge, gram, hardness, horology, iconometer, inch, kilogram, liter, meter, metric system, mil, milliliter, millimeter, paper, pi,… …   Glossary of Art Terms

  • pencil hardness —    a traditional measure of the hardness of the leads (actually made of graphite) in pencils. The hardness scale, from softer to harder, takes the form ..., 3B, 2B, B, HB, F, H, 2H, 3H, 4H, .... The letters stand for Black, Hard, and Firm. (There …   Dictionary of units of measurement

  • Vickers 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… …   Wikipedia

  • Barcol hardness — (BH)    a measure of hardness, primarily for plastics and soft metals, made with a Barcol Impressor. Measurements on the Barcol scale are typically between 30 and 90. There is no precise conversion between these readings and other hardness scales …   Dictionary of units of measurement

  • American hardness — a measure of hardness used in the USA. One degree is equal to 1 mg/l …   Dictionary of ichthyology

  • international rubber hardness degree — (IRHD)    a unit used to measure the hardness of rubber and similar materials (technically known as elastomers). Measurements are made using an IRHD durometer, and the results are usually similar, but not identical, to readings made with the… …   Dictionary of units of measurement

  • Barcol 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… …   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

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