What, then, must be the result of an accumulation of impurities in the physical system?
The colon being clogged, Nature is trying to cast out the impurities by way of the pores of the skin, and when these become congested we have fever.
In cases of sickness, where it becomes necessary to assist Nature in ridding the system of impurities through the medium of the sweat glands, the "wet sheet pack" will be found invaluable.
The chief objects aimed at by the comber are:--To extract all fibres below a certain length; to make the fibres parallel; and to extract any fine impurities that may have escaped the scutching and carding processes.
These impurities and vapours gave its poisonous and suffocating character to the breath.
That during recovery the lungs are heavily taxed in purifying the vitiated blood, as shown by the excessive amount of organic impurities exhaled.
The object of analysis consisted in estimating the accompanying impurities of fat, as, resin, albuminoids, and pigments.
An air-blast is injected through the molten mass, and the impurities are burnt, or oxidised as it is chemically termed.
It must be explained that in the manufacture of steel from pig-iron certain impurities in the raw material have to be got rid of in order to produce a good steel.
The impurities present in clay, which consist of alkalies, especially potash and other mineral ingredients of the plant, are what confer on clay soils their fertility.
The amount of sand and earthy impurities also varies very considerably.
The chief impurities which it is likely to contain are an excess of moisture, free acid, or the presence of insoluble matter.
Among these impurities one of the most important is phosphorus.
Cut it off the water, scrape the impurities from the bottom, and it will be ready for use.
If the pores of the latter be obstructed and occluded in this manner, the impurities which should be removed from the system cannot escape, and have therefore to be expelled by some other channel.
The impurities pass into the water solution together with the sodium sulphate, but, being present in such minute amounts, do not again precipitate with the barium sulphate.
Note 3: The impurities are probably weighed with the original precipitate in the form of oxides.
It is getting rid of these impurities that makes the production of steel such a roundabout process with us.
But a minute increase of this gas in the atmosphere is of most importance from the fact that it always comes in bad company, and is found to be a measure of the many impurities which accompany it.
Let us glance briefly at the principal sources from which these impurities rise.
The water is often distilled a second time to remove any impurities which it might still contain.
Remove all the impurities from the surface of the zinc when it is melted, with a metal spoon or piece of tin.
Slight impurities in the earths or the gas will speedily spoil the light.
As usual, the oxygen combines with carbon, the impurities form slag which floats on the top, and the pure metal falls to the bottom of the furnace from whence it can be drawn off.
It is found that anyimpurities in the metal--and it is impossible to make it without some impurities--collect in that part which cools last and obviously that part of a block which cools last is the centre.
Thus the impurities gather together in the centre of the mass whence they are removed when that centre is cut away, whereas if the first casting were a tube they would collect in a part which would remain in the finished gun.
All of them may be regarded as impure forms of ethyl alcohol, the various impurities giving to each its particular taste.
The hammering process has the effect of driving out impuritiesand also of improving the texture of the metal.
Along with the coal and ore, there is thrown into the furnace from time to time quantities of limestone which combines with the earthy impurities with which the ore is contaminated.
Since impurities are apt to rise, while the metal is liquid, the top of the ingot is always cut off and discarded.
It used to be the custom to keep some white mice on board a submarine to give warning of the impuritiesin the air.
And your reasoning leads you to this conclusion, that we must build a sewer to draw off the alleged impurities from Molledal and must relay the water conduits.
You said yesterday that the pollution of the water was due to impurities in the soil.
These things are supposed to have an affinity for the dirt, and to increase the volume of impurities which rise to the surface.
As the temperature rises, a thick scum appears on the surface, consisting of such impurities as may have passed through the meshes of the strainer.
Also that the veins may carry away all impurities dependent upon them for renovation.
Here we find a place for the white corpuscles building anew and giving strength to throw impurities from the body by tubes that run from the skin to tanks of useful fluids, that would heap up and are no longer of use in the body.
Remember that this purity depends first upon pure food and functional strength, in order that a good quality of blood may be produced; and secondly, upon active elimination of wastes, poisons and impurities in general.
Hot water has a profound influence upon the elimination of wastes and impurities through the skin.
In the work of eliminating impurities and keeping the system clean the kidneys are to be classed with the lungs, although they have to do with poisonous wastes of a different type.
I have said nothing of solid or undissolved impurities in water, which are said to be in suspension, for the separation of these is a merely mechanical matter of settling, or filtration and settling combined.
Filtration, we must remember, will, as a rule, only remove solid or suspended impurities in water.
Serious damage may be done to the dyer by either of these classes of impurities, and I may tell you that the dissolved calcareous and magnesianimpurities are the most frequent in occurrence and the most injurious.
The distillate is diluted with water, run off from any oily impurities which are separated, and re-distilled once or twice after treatment with quicklime.
There are no common sewers in Sydney; and, although the greater portion of the town stands upon a height, yet many of the principal streets are perfectly level, and the want of a vent for the foul water and other impurities is sadly felt.
It is therefore necessary that the solution should be free from metals which may vitiate the results, or special precautions taken by which the impurities are rendered harmless.
These impurities may, to a certain extent, be eliminated by good straining, but a surer prevention is to have the cow-house perfectly clean and free from dust, as dust specks are in many cases the vehicles of disease germs.
These organisms are shown in the appended photo-micrographs, and constitute impurities in the preparation.
It is constantly eliminating impurities from the earth and the air.
Roots assist in drainage, and absorb impurities from the soil.
Other impurities such as zinc and manganese sulphates are more difficult to remove, and hence to prepare the pure salt it is best to dissolve pure iron wire in dilute sulphuric acid.
If the initial quantity of phosphorus or sulphur is large, or if the removal of these impurities is to be made very thorough, the dephosphorizing or the desulphurizing slagging off may be repeated.
Thus the distinctive work of the second and third periods is freeing the metal from mechanical impurities by fusion.
The chief impurities are copper and ferric sulphates; the former may be removed by adding scrap iron, which precipitates the copper; the latter is eliminated by recrystallization.
Internally, the tubes must be kept free from scale, the ingredients of which a study of the chapter on the impurities of water indicates are present in varying quantities in all feed waters.
Scale--Scale is formed on boiler heating surfaces by the depositing of impurities in the feed water in the form of a more or less hard adherent crust.
For common salt, this is approximately a constant at all temperatures, while with such impurities as magnesium and sodium sulphates, this solvent power increases with an increase in temperature.
The efficiency of such apparatus will depend wholly upon the amount and character of the impurities in the water to be treated.
This is a serious defect in that it allowsimpurities and sediment to collect in a portion of the boiler not easily inspected, and corrosion may result.
Table 14 gives a list of impurities which may be found in boiler feed water, grouped according to their effect on boiler operation and giving the customary method used for overcoming difficulty to which they lead.
A mud drum to receive all impurities deposited from the water, and so placed as to be removed from the action of the fire.
Such deposits are due to the fact that water loses its soluble power at high temperatures or because the concentration becomes so high, due to evaporation, that the impurities crystallize and adhere to the boiler surfaces.
In some few instances, the impurities may be taken care of by some method of water treatment but such water should be submitted to an authority on the subject before any treatment apparatus is installed.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "impurities" in a variety of sentences. We hope that you will now be able to make sentences using this word.
