Word Finder - concentration

definition

The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated.

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A field or course of study on which one focuses, especially as a student in a college or university.

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The proportion of a substance in a whole.

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The matching game pelmanism.

Jackson lost concentration in remembering her.

Her father's voice broke her concentration.

Her concentration was on the clothes, and he tried not to smile as she spent a minute petting a sweater.

Tim's voice interrupted his concentration.

Thus silver, at one end of the cell in contact with many silver ions of the silver nitrate solution, at the other end is in contact with a liquid in which the concentration of those ions is very small indeed.

When the dissolved molecules are uniformly distributed, the osmotic pressure will be the same everywhere throughout the solution, but, if the concentration vary from point to point, the pressure will vary also.

On these lines the equations of concentration cells, deduced above on less hypothetical grounds, may be regained.

The concentration of the simple copper ions is then so much diminished that the copper plate becomes an anode with regard to zinc. Thus the cell - copper I potassium cyanide solution I potassium sulphate solution - zinc sulphate solution I zinc - gives a current which carries copper into solution and deposits zinc. In a similar way silver could be made to act as anode with respect to cadmium.

It is now evident that the electromotive force of an ordinary chemical cell such as that of Daniell depends on the concentration of the solutions as well as on the nature of the metals.

Dolezalek, however, has attributed the difference to mechanical hindrances, which prevent the equalization of acid concentration in the neighbourhood of the electrodes, rather than to any essentially irreversible chemical action.

There must, then, be a relation between the rate of change of the concentration and the osmotic pressure gradient, and thus we may consider the osmotic pressure gradient as a force driving the solute through a viscous medium.

The results give equations of the same logarithmic form as those obtained in a somewhat different manner in the theory of concentration cells described above, and have been verified by experiment.

The specific rotation also varies with the concentration; this is due to the dissociation of complex molecules into simpler ones, a view confirmed by cryoscopic measurements.

There is a special marginal nerve running round the edge of the mantle, but the connexion of this with the rest of the nervous system is not clear; probably it is merely another concentration of the diffused sub-ectodermal nervous fibrils.

Thus, while cupellation still furnishes the only means for the final separation of lead and silver, it has become an auxiliary process to the two methods of concentration given.

As Cicero tones down his oratory in his moral treatises, so Horace tones down the fervour of his lyrical utterances in his Epistles, and thus produces a style combining the ease of the best epistolary style with the grace and concentration of poetry - the style, as it has been called, of "idealized common sense," that of the urbanus and cultivated man of the world who is also in his hours of inspiration a genuine poet.

The processes of evaporation and concentration are carried on as they are in a cane sugar factory, but with this advantage, that the beet solutions are freer from gum and glucose than those obtained from sugar-canes, and are therefore easier to cook.

The ambitions of Mehemet Ali of Egypt were not yet fully revealed; but Ali of Jannina, who had marched to the aid of the sultan against the rebellious pasha Pasvan Oglu of Widdin, soon began to show his hand, and it needed the concentration of all the forces of the Turkish empire to effect his overthrow and death (1822).

The concentration of nervous matter and ganglionic substance at the oral end of Trematodes is equivalent to the " brain " of the Planarians, but the similar thickening in the scolex of Cestodes is by no means so certainly to be called by that name.

The Wetherill system of magnetic concentration has been remarkably successful in separating the minerals contained in the well-known deposit in Sussex (disambiguation)|Sussex county, N.J.

Neither mechanical nor magnetic concentration can effect much in the way of separation when, as in many complex ores, carbonates of iron, calcium and magnesium replace the isomorphous zinc carbonate, when some iron sulphide containing less sulphur than pyrites replaces zinc sulphide, and when gold and silver are contained in the zinc ore itself.

Even more important than the assistance which the concentration of the German trade at Bruges gave to that leading mart of European commerce was the service rendered by the German counter of Bruges to the cause of Hanseatic unity.

Great as were his eloquence, his knowledge and his financial skill, Gladstone was accustomed to say of himself that the only quality in which, so far as he knew, he was distinguished from his fellow-men was his faculty of concentration.

The poison is a clear, pale-yellow fluid which reacts acid, and contains about 30% of solids, but this varies according to the state of concentration.

The Confederates concentrated above 40,000 men at Corinth and advanced on Pittsburg Landing with a view to beating Grant before Buell's arrival, but their concentration had left them only a narrow margin of time, and the advance was further delayed by the wretched condition of the roads.

The process is rarely applied to ores direct; free-milling ores are generally amalgamated, and the tailings and slimes, after concentration, operated upon.

Tegea was one of the most ancient cities of Peloponnesus; tradition ascribed its concentration (synoecism) out of eight or nine primitive cantons to a mythical king Aleus.

There must be considerable dissociation of molecules, and as a first approximation it may be taken that of io molecules of most of the components about 9 (or in the case of magnesium sulphate 5) have been separated into their ions, and that it is only during slow concentration as in a natural saline that the ions combine to produce the various salts in the proportions set out in the above table.

Fox, of the Central Laboratory of the International Council at Christiania, has investigated the relation of the atmospheric gases to sea-water by very exact experimental methods and arrived at the following expressions for the absorption of oxygen and nitrogen by sea-water of different degrees of concentration.

Differences of density between the waters of enclosed seas and of the ocean are brought about in some instances by concentration of the water of the sea on account of active evaporation, and in other instances by dilution on account of the great influx of land water.

Modern research has proved that such reactions are not occasioned by water acting as H 2 0, but really by its ions (hydrions and hydroxidions), for the velocity is proportional (in accordance with the law of chemical mass action) to the concentration of these ions.

The necessary three days' warning of the French concentration they felt certain they would obtain, for Napoleon's troops were at this juncture distributed over an area (Lille-Metz-Paris) of 175 m.

He had to delay the French advance for 24 hours and give time for Blucher's concentration, at the same time retaining his own freedom of manoeuvre, and this in spite of the great length of the summer day, the short distance that he lay 'in front of Fleurus, the tremendous numerical superiority of the French and Napoleon's personal presence at their head.

The exposure time required to cause miosis depends on agent concentration.

It will be seen that Blucher covered Fleurus, his concentration point, by Zieten's corps, in the hope of being able to collect his army round Fleurus in the time that Zieten would secure for him by a yielding fight.

He directed that the movements of the troops when they drew near the allied outposts should be covered as far as possible by accidents of ground, for there was no great natural screen to cover his strategical concentration.

Corps from Metz, having the longest distance to go, started first (on June 6), and soon the whole army was The in motion for the selected points of concentration, French every effort being made to hide the movements of the concen.

As soon as the Prussian marshal got the first real warning of imminent danger, he ordered (in accordance with the prearranged plan) an immediate concentration of his army on his inner flank at Sombreffe.

Failing to appreciate this fully, Wellington omitted to order an immediate concentration on his inner (left) flank as Blucher had done, and the danger of Blucher's position was thus enormously increased.

Thus, thanks to Zieten's fine delaying action, Blucher by nightfall on June 15 had secured most of the ground requisite for his pre-arranged concentration; for one corps was in position, and two others were at hand.

Wellington, owing to his original dispositions and the slowness of his concentration, had only retained a grip on Quatre Bras thanks to the boldness of his subordinates on the spot.

But if the intelligence which the duke rightly relied on had come to hand on the r 5th, it cannot be doubted that he would have effected a more expeditious concentration on his inner flank.

The allies were thus afforded an opportunity of committing the very blunder which Napoleon longed for, namely to attempt a risky forward concentration.

Napoleon's original plan for the 16th was based on the assumption that the allies, who had been caught napping, would not attempt a risky forward concentration; and he intended therefore to push an advanced guard as far as Gembloux, for the purpose of feeling for and warding off Blucher.

As he surveyed the field from the windmill north of Fleurus it struck him as significant that Blucher's troops were disposed parallel to the Namur road, as if to cover a forward concentration, and not at right angles to it, as they would be had they been covering a retreat.

The railways and constabulary of the two colonies were (1903) placed under an inter-colonial council; active measures were taken for the repatriation of the prisoners of war and the residents in the concentration camps, and in every direction vigorous and successful efforts were made to repair the ravages of the war.

He therefore chose Liao-Yang as the point of concentration, and having thus to gain time by force instead of by distance, he pushed out a strong covering detachment towards the Yalu.

A few days later, Zasulich's persistent requests to be allowed to retreat and the still uncertain movements of the 2nd Army induced him once more to prepare a concentration on Mukden.

The concentration of the various Japanese armies on one battlefield was to be made, not along the circumference of the long arc they occupied, but towards the centre.

The Motienling pass, however, had been seized without difficulty, and Keller's power of counterattack had been reduced to nothing by the despatch of most of his forces to the concentration at Tashichiao.