Specific inductive capacity

Dielectric Constant. Dielectric constant or specific inductive capacity (SIC) is both defined and measured by the ratio of the electric capacity of a condenser having that material as the dielectric to the capacity of the same condenser having air as the dielectric. The dielectric constant of vacuum is unity. Dry air has a constant slightly higher but for most practical purposes it is considered as unity. 

Dielectric constant (specific inductive capacity, relative permittivity) over a wide range of temperature and frequency. 

The influence of a particular dielectric on the capacitance of a condenser is conveniently assessed by the dielectric constant, also known as the relative permittivity or rarely specific inductive capacity. This is defined as the ratio of the relative condenser capacity, using the given material as a dielectric, to the capacity of the same condenser, without dielectric, in a vacuum (or for all practical intents and purposes, air). 

Gauss s theorem, where K is the specific inductive capacity of... 

Burton has likewise investigated the effect of the medium on the mobility and on the transverse potential fall since these should be dependent both on the viscosity and oh the specific inductive capacity as typical of the results obtained the following may be cited ... 

Although an alteration in the specific inductive capacity of the double layer may be effected by the selective adsorption of the non-electrolyte yet such an explanation is evidently by no means adequate thus we find 1500 millimols. of ethyl alcohol as effective as 70 millimols. of isoamyl alcohol, whilst the dielectric capacities of water and the two alcohols stand in the ratio 81 20 8 5 7 again the anomalous behaviour of di- and tetravalent cations as noted by Efruyt and van Duin is not explicable on this hypothesis. 

Some of the more important dielectric properties are dielectric loss, loss factor, dielectric constant (or specific inductive capacity), dc conductivity, ac conductivity, and electric breakdown strength. The term dielectric behavior usually refers to the variation of these properties within materials as a function of frequency, composition, voltage, pressure, and temperature. 

M = z f Ffi, where ja is the magnetic permeability of the medium (assumed to be equal to unity for air) F, the force at a point in magnetic field and r the distance between the poles. It follows that F = mm V jur2 ESU ate based on the strength of electrical charges (q and q ) q = Fk, where k is the specific inductive capacity ot dielectric constant (assumed as unity for air F, the force between two charges and r the distance. It follows that F =qqVkc2(See also " Electrostatic Law of Coulomb )... 

The dielectric constant (specific inductive capacity) is a measure of electrostatic polarizability and of the amount of electricity that can be stored in coal. The dielectric constant is more useful than electrical conductivity in characterizing coal and is a measure of the electrostatic polarizability of the dielectric coal. The dielectric constant of coal is believed to be related to the polarizability of the tt-elecirons in the clusters of aromatic rings in the coal chemical structure. 

In the case of a cloud of charged particles, let the totality of charge be i , and k the specific inductive capacity, then... 

Since the scalar dielectric constant (or called specific inductive capacity) is defined by... 

If any dielectric (condenser) be subject to a difference of potential, the density p of the charge constantly diminishes according to the relation p=be at, where b is an empirical constant and a is a constant equal to the product 47r into the coefficient of conductivity, c, of the dielectric, and the time, t, divided by the specific inductive capacity, /x, i.e., a = Airct/p.. Hence show that the gradual discharge of a condenser follows the compound interest law. Ansr. Show dpjdt = - ap. 

All other indirect or direct methods of moisture determination (assessment of amount of steam, measuring the specific inductive capacity and others), as described in [1] and [5] are usually not employed in ceramics, as these are time consuming and do not provide reproducible measuring results. 

Faraday s next work was on self-induction (IX) and some unimportant modifications of the old type of battery (X). He then took up his fundamental work on dielectrics and specific inductive capacity, which he linked to his work on electrolysis (XI). 

Permittivity is a measure of the degree to which an insulating medium can induce an electric charge between conducting planes. It is measured in Farads per meter. The absolute permittivity of free space (Cq) has a value of 8.85 X 10 2 Farad per metre. The relative permittivity (e) of a substance is the ratio of its absolute permittivity to Cq e value of varies from unity (for a vacuum) to over 4000 (for ferroelectrics). The quantity is also called the dielectric constant of specific inductive capacity of the material. 

However, this does not represent his only quantitative work. See M. Faraday, "Experimental Researches in Electricity -Eleventh Series. On Induction", Phil.Trans.. 1838, 128 1-40, section v for his work on specific inductive capacity. 

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