Word Finder - hardness

definition

The quality of being hard.

definition

An instance of this quality; hardship.

definition

The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm).

definition

The resistance to scratching, cutting, indentation or abrasion of a metal or other solid material.

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The penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation.

definition

The measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack.

The hardness came back into his eyes and he looked away.

You get used to knowing the different types of hardness and thickness.

The presence of the antimony in this alloy gives to it hardness, and the property of expanding on solidification, thus allowing a sharp cast of the letter to be taken.

The Dongola breed of horses is noted for its strength and hardness.

The problem is the extreme hardness of the ' cap ', thus the Kango.

The time required to make a herbal infusion depends on the hardness of the particular herb.

Its combination of permanent lubricity and high hardness enabled filters to be easily released and significantly extended the life of the molds.

Diamolith's 3000 Hv range and excellent lubricity will enable us to offer customers the optimum combination of hardness and low friction.

Some sensitivity coefficients can be calculated by taking partial derivatives of the equation defining the hardness value.

As a result of soil testing the STRI researched requirements for hardness, traction, ball rebound, sward height and grass cover.

Such properties in this case may include tensile strength, hardness, wear resistance and machinability among many others.

Smaller tools will include a hand lens, hardness tester, color char and magnet.

The chief crops of the farmer are wheat (which from its flinty hardness and full kernel is the specialty of the Canadian north-west), oats, barley and pease.

The hardness is 22 and the specific gravity 2.8.

The colour varies from yellowish or reddish to blackish-brown, and by transmitted light it is often blood-red; the streak is brownish-yellow; hardness, 5; specific gravity, 4.3.

If it contains a few parts of carbon per thousand, the annealing process, instead of softening the metal, gives it a "temper," meaning a higher degree of hardness and elasticity (see below).

The hardness (6-62) is the same as that of pyrites, and the specific gravity (4.8-4.9) as a rule rather less.

Aluminium oxide or alumina, Al 2 0 3, occurs in nature as the mineral corundum, notable for its hardness and abrasive power (see Emery), and in well-crystallized forms it constitutes, when coloured by various metallic oxides, the gem-stones, sapphire, oriental topaz, oriental amethyst and oriental emerald.

These movements, promoted by the councils of Constance and Basel, partook of the spirit of the time and were characterized by an extreme austerity of life and a certain hardness of spirit, and a sort of police regulation easily understandable at a time of reaction from grave abuses.

The results serve to show the great value of Australian timbers, and the comparisons made with the typical timbers of many other countries emphasize the fact that the Australian woods are equal to any in the world for hardness, strength and durability.

Be 100 percent sure of the hardness of your water so you don't spend too much getting one that won't soften the water efficiently or not spend enough so your water doesn't get softened.

The scientific name Cornus is Latin for 'horn', and is probably another reference to the hardness of the wood.

With a rating of 9 on the Mohs hardness scale, the only harder gem is the diamond.

Succinite has a hardness between 2 and 3,.

The substitution of steel for iron as the material for rails which made possible the axle loads and the speeds of Lto-day, and, by reducing the cost of maintenance, contributed enormously to the economic efficiency of railways, was one of the most important events in the history of railways, and a scarcely less important element of progressive economy has been the continued improvement of the steel rail in stiffness of section and in toughness and hardness of material.

It is an ironblack, opaque mineral, with metallic lustre; hardness about 6, sp. gr.

Marcianus, and the type is different from that of the Roman catacombs, the galleries being far larger (partly owing to the hardness of the limestone in which they are excavated), and having circular chambers at the points * of junction.

The wood used is generally that of the cherry-tree, sakura, which has a grain of peculiar evenness and hardness.

When not tarnished, the mineral has a silver-white colour with a tinge of red, and the lustre is metallic. Hardness 2-21; specific gravity 9-70-9.83.

Red clay is the deposit peculiar to the abysmal area; 70 carefully investigated samples collected by the " Challenger " came from an average depth of 2730 fathoms, 97 specimens collected by the " Tuscarora " came from an average depth of 2860 fathoms, and 26 samples obtained by the " Albatross " in the Central Pacific came from an average depth of 2620 fathoms. Red clay has not yet been found in depths less than 2200 fathoms. The main ingredient of the deposit is a stiff clay which is plastic when fresh, but dries to a stony hardness.

The characters of softness or hardness, dryness or moisture, &c., are taken account of in these classifications.

Such stones have been occasionally cut as lenses for microscopes, being recommended for such use by their high refractivity, weak dispersion and great hardness.

The ridges and intervening valleys, long parts of which have an approximately parallel trend from south-west to north-east, were formed by the erosion of folded sediments of varying hardness, the weak belts of rock being etched out to form valleys and the hard belts remaining as mountain ridges.

The metal produces an enormous number of useful alloys, some of which, containing only i or 2% of other metals, combine the lightness of aluminium itself with far greater hardness and strength.

Its hardness is about 6, and its specific gravity 4 9 to 5.2, being rather more than that of marcasite.

From copper-pyrites (chalcopyrite) iron-pyrites is distinguished by its superior hardness and by its paler colour.

But the invaluable and rather delicate art of tempering the hardened steel by a very careful and gentle reheating, which removes its extreme brittleness though leaving most of ifs precious hardness, needs such skilful handling that it can hardly have become known until very long after the art of hot-forging.

These include the austenitic or gamma non-magnetic manganese steel, already patented b y Robert Hadfield in 1883, the first important known substance which combined great malleableness with great hardness, and the martensitic or beta " high speed tool steel " of White and Taylor, which retains its hardness and cutting power even at a red heat.

Austenite may contain carbon in any proportion up to about 2.2 It is non-magnetic, and, when preserved in the cold either by quenching or by the presence of manganese, nickel, &c., it has a very remarkable combination of great malleability with very marked hardness, though it is less hard than common carbon steel is when hardened, and probably less hard than martensite.

The degree of hardening which the steel undergoes increases with its carbon-content, chiefly because, during sudden cooling, the presence of carbon acts like a brake to impede the transformations, and thus to increase the quantity of 0-iron caught in transit, but probably also in part because the hardness of this 0-iron increases with its carbon-content.

This brittleness has therefore in general to be mitigated or " tempered," unfortunately at the cost of losing part of the hardness proper, by reheating the hardened steel slightly,

But in most such cases, in spite of the annealing, this hardness is accompanied by a degree of brittleness too great for most purposes.

The general order of merit of a given variety or specimen of iron or steel may be measured by the degree to which it combines strength and hardness with ductility.

Nickel steel, which usually contains from 3 to 3.50% of nickel and about 0.25% of carbon, combines very great tensile strength and hardness, and a very high limit of elasticity, with great ductility.

But its great hardness is not materially affected by the rate of cooling.

It is used extensively for objects which require both hardness and ductility, such as rock-crushing machinery, railway crossings, mine-car wheels and safes.

Chrome steel, which usually contains about 2% of chromium and o 80 to 2% of carbon, owes its value to combining, when in the " hardened " or suddenly cooled state, intense hardness with a high elastic limit, so that it is neither deformed permanently nor cracked by extremely violent shocks.

The hardness of the hardened chrome steel resists the burglar's drill, and the ductility of the wrought iron the blows of his sledge.

Its specific gravity is 5.2, and its hardness 5.5 to 6.5.

Its specific gravity is 5.3 and its hardness 5.5 to 6.5.