Electrical conductivity is a measure of how well a material accommodates the transport of electric charge. Its SI derived unit is the siemens per metre, (A2s3m-3kg-1) (named after Werner von Siemens). It is the ratio of the current density to the electric field strength. This applies also to the electrolytic conductivity of a fluid.
A conductor such as a metal has high conductivity, and an insulator like glass or a vacuum has low conductivity. A semiconductor has a conductivity that varies widely under different conditions, such as exposure of the material to electric fields or certain frequencies of light.
For the use of conductivity measurements to record pH spectra which shows the interaction between different molecules as a function of the degree of dissociation of their functional groups, see the following external links:
"The Theoprax Method" (http://www.theoprax-research.com/theoprax.pdf) (PDF)
conduction transfer of heat or electricity through a substance, resulting from a difference in temperature between different parts of the substance, in the case of heat, or from a difference in electric potential, in the case of electricity.
In solids, electric current consists of a flow of electrons; as in the case of heatconduction, metals are better conductors of electricity because of their greater free-electron density, while nonmetals, such as rubber, are poor conductors and may be used as electrical insulators, or dielectrics.
The role of sensory nerveconduction study of the palmar cutaneous nerve in the diagnosis of carpal tunnel syndrome in patients with polyneuropathy
Gradient heat transport depends on three quantities: the conductivity of the material, the cross-sectional area of the material, and the spatial gradient of temperature.
The larger the conductivity, gradient,and/or cross-section, the faster the heat flows.
In this experiment, the flow of heat through a collection of conductive bars which vary in cross-section is simulated.
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