Among these effects may be cited those of adsorption, increased chemical reactivity due to enlarged areas of contact, permeability and diffusion, etc.
The magnetic permeability decreases as the magnetization increases.
From tests it has been shown that permeability increases with the flux density up to a certain point and then decreases, indicating that the iron is approaching a state of saturation.
The permeability of good soft wrought iron is sometimes 3000 times that of air, varying with the quality of the iron.
With regard to the fall of turgor, it is not definitely known whether excitation causes a sudden diminution in the osmotic strength of the cell-sap or an increase in the permeability of the ectoplast to the osmotic constituents of the cell.
Whatever difference of opinion there may be in regard to the theories of osmotic and permeability variations, we have the indubitable fact of diminution of turgor and contractile fall of the pulvinus of Mimosa under excitation.
In this altered condition, the membrane no longer allows the passage through it of either sulphate of ammonia or nitrate of barium, though it retains its permeability for water and chloride of ammonia.
From these facts we may conclude that the great difference in the degree and rate at which various kinds of seeds excite secretion, is chiefly or wholly due to the different permeability of their coats.
The perforations of the earthworm mechanically affect the texture of the soil and its permeability by water, and they therefore have a certain influence on the form and character of surface.
The perforations of the earthworms and of many insect larvae mechanically affect the texture of the soil and its permeability by water, and they therefore have a certain influence on the form and character of terrestrial surface.
It is seen from an inspection of these curves that as the magnetizing force =H= increases, the intensity of flux also increases, but at a gradually lessening rate, indicating a reduction in permeability at the higher densities.
Obviously, it should be of the highestpermeability and, furthermore, there should be ample cross-section of core to prevent even an approach to saturation.
More accurately, the permeability is the ratio existing between the amount of magnetization and the magnetizing force which produces such magnetization.
The permeability of a substance is usually represented by the Greek letter µ (pronounced mu).
In permeability curves the total magnetization of the given pieces of iron are plotted as abscissas, while the corresponding permeabilities are plotted as ordinates.
The iron should, if possible, be worked at that density of magnetization at which it has the highest permeability in order to obtain the maximum impedance effects.
Unfortunately for easy calculations in electromagnetic work, however, this is not true of the permeability of iron.
He shows how, by maintaining by continuous magnetization a flow of lines through the iron, the latter may be kept near its maximumpermeability and a higher output and economy may be secured in such apparatus.
I also endeavored to ascertain the influence of a medium of high permeability by using oxygen.
Suppose that the permeability depends upon the force of the uprushes from below the diaphragm rather than on the tendency to sink downwards from above it.
Variations in the quantity of lymph issuing from different organs have been on this theory ascribed to differences in the permeability of the capillaries of the organs.
It practically refutes the idea that lymph formation is solely dependent upon such processes as filtration, osmosis and capillary permeability only.
The amount of fluid movement also is further determined by osmotic actions and by the permeability of the capillary wall.
When the proportion of aluminium to manganese was made a little greater or smaller, the permeability was diminished.
When it is mechanically hardened by hammering, rolling or wire-drawing itspermeability may be greatly diminished, especially under a moderate magnetizing force.
The permeability of most material substances differs very slightly from unity, being a little greater than 1 in paramagnetic and a little less in diamagnetic substances.
They found that the permeability of Swedish iron, tungsten-steel and nickel, when the metals were cooled to -186 deg.
Steel behaves in a similar manner, but the maximum permeability is not so high as in iron, and the fall, when the critical point is approached, is less abrupt.
The practice of measuring magnetic induction and permeability with scientific accuracy was introduced in 1873 by H.
The addition of silicon in small quantities considerably diminished permeability and increased coercive force; but when the proportion amounted to 2.
The aluminium-iron attained its greatest permeability in a field of 0.
Ewing has also studied the effect of vibration in conferring upon iron an apparent or spurious permeability of high value; this effort also is most conspicuous when the magnetizing force is weak.
To secure the highest possible permeability it is essential that the iron should be softened by careful annealing.
The induction for considerable forces was found to be greater in a steel containing 73% of nickel than in one with only 33%, though the permeability of pure nickel is much less than that of iron.
The permeability of such beds will, of course, depend wholly upon the nature of the deposit.
The permeability of these deposits allows the water to flow away subterraneously to a great distance from the points at which it enters.
This proximity and permeabilityare both provided for by the structure and constitution of the nervous system.
In addition to their texture or permeability to air, and to their conducting or non-contracting powers, fabrics also vary according to their hygroscopic qualities.
Illustration: Bottles Showing Relative Permeabilityof Films by Amount of Whiting Formed Within] =The Permeability of Paint Films.
Illustration: Bell Jar Apparatus for Testing Permeability of Paint Films Paint films sealed over mouths of Bottles containing Lime Water.
Iron has a greater magnetic permeability than air.
Experiments show that a simple acute hydræmia produces no increased transudation, and that a chronic hydræmia, if connected with dropsy, is likely to be influential by increasing the permeability of the wall.
Mr. Feret also found that permeability decreased with time and that wet mixtures were less permeable than dry mixtures.
The minimum permeabilityis found in mortars where the proportion of medium-sized grains is small, and the coarse and fine grains are about equal to each other.
The coefficient L for a given coil is a constant quantity so long as the magnetic permeability of the material surrounding the coil does not change.
The permeability of a given sample of iron is not constant, but decreases in value as the magnetizing force increases.
It was formerly the custom to inject the fluids into the sac; but this is unnecessary so long as the puncta and canaliculi remain pervious, and the permeability of these can be readily ascertained by means of a small probe.
He speaks of this in the following terms:--'The permeability of such homogeneous substances as platinum and iron is quite different from the passage of gases through such non-compact substances as clay and graphite.
The permeability of metals depends on their expansion, brought about by heat, and proves that metals and alloys have a certain porosity.
The rate of the passage of gases through india-rubber does not, as Mitchell and Graham showed, depend on their densities, and consequently its permeability is not determined by orifices.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "permeability" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: electromagnetism; hysteresis; magnetism
