Electrical resistivity definition

This formula shows the factorial effect of the separator on the electrical resistance the measured resistance of the electrolyte-filled separator is the (T2]P) - fold multiple of the electrolyte resistance without the separator by definition, T2/P > 1. 

As examples of properties of systems satisfying the conditions of definiteness at a particular temperature and of reversion, we may refer to the electrical resistance of a metal wire the electromotive force of a thermocouple with a fixed temperature at the cold junction the volume of a homogeneous gaseous, liquid, or... 

The electrical conductivity of a pure arsenic crystal has been measured 3 at temperatures down to 2-42° Abs. The resistance-temperature curve is similar to those of pure metals. There is evidence of definite residual resistance being maintained at low temperatures, but arsenic does not exhibit the abnormally high residual resistance shown by bismuth, nor does it show superconductivity. The resistance is by no means proportional to the absolute temperature. It has been estimated that the electrical resistance of liquid arsenic at the melting point is about 0-4 of that of the solid phase.4... 

Measurement of the electric resistance of aqueous solutions of ferric chloride indicates a gradual increase in conductivity after dilution, a definite maximum value ultimately being reached for each concentration of the salt. The time required to reach a final stage of equilibrium varies with the concentration of the salt. For a 0-0001-normal solution some three hours are required, whilst a week is usual for a 0-0006-normal solution.3 This increase in conductivity is usually attributed to the gradual liberation of hydrochloric acid in accordance with the... 

The previous definitions can be interpreted in terms of ionic-species diffusivities and conductivities. The latter are easily measured and depend on temperature and composition. For example, the equivalent conductance A is commonly tabulated in chemistry handbooks as the limiting (infinite dilution) conductance A and at standard concentrations, typically at 25°C. A = 1000 K/C = X+ + X = A + flC), (cmVohm gequiv) K = a/R = specific conductance, (ohm cm) C = solution concentration, (gequiv/ ) a = conductance cell constant (measured), (cm ) R = solution electrical resistance, which is measured (ohm) and/(C) = a complicated function of concentration. The resulting equation of the electrolyte diffusivity is... 

Metals and semiconductors have positive and negative slopes in their electrical resistivity p) vs. temperature (T) curves as schematically shown in (109) and (110), respectively. By definition, the Fermi surface disappears when a band gap opens at the Fermi level. If the Fermi surface nesting is complete, all the Fermi surface is removed by the appropriate orbital mixing. However, if the Fermi surface nesting is incomplete, only the nested portion of the surface is removed by orbital mixing. The unnested portion is left as small Fermi surface pockets. The system will thus retain its metallic properties although the number of carriers (i.e. those electrons at the Fermi level) will be... 

When the formulated solution predominantly contains polyols, sugars, or polymers, the interstitial phase does not usually crystallize out upon cooling but increases progressively in viscosity as a glass-like system. In the case where the interstitial phase has effectively the structure of a glass, the frozen system becomes fully rigid once the glass transition temperature (Fg) is reached. In contrast, some amorphous systems may show no such definite transition, but they eventually become very stiff at low temperature, as shown by electrical resistance studies. 

There are two definitive tests for superconductivity zero electrical resistance and expulsion of magnetic flux. Both were demonstrated in the first KaCeo experiments, in thin films and powder samples, respectively.[He91 ] Initial efforts to observe superconductivity in Rb-doped films were unsuccessful, but the exposure of Ceo powder to Rb vapor, followed by appropriate heat treatment, did produce superconducting samples with a transition temperature of 28 K.[Ro91, Ho91a ]... 

Resistivity is a term used to describe the resistance of a medium to the flow of an electrical current. By definition, the resistivity is the electrical resistance of a dust sample 1 cm in cross-sectional area and 1 cm thick. For ease of precipitation capture, dust resistivity values can be classified roughly into three groups ... 

Specific Conductance, etc. Definitions. The conductance, ic, of a conductor of electricity is the reciprocal of its electrical resistance, k, or... 

It has proved useful to interpret the deposition process in terras of an electrical resistance analogy, in which the transport of material to the surface is assumed to be governed by three resistances in series the aerodynamic resistance ra, the quasi-laminar layer resistance rt, and the surface or canopy (the term canopy refers to the vegetation canopy) resistance rc. The total resistance, rt, to deposition of a gaseous species is the sum of the three individual resistances and is, by definition, the inverse of the deposition velocity ... 

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