Electric conductivity is a measure of the strength of a material's ability to conduct current. When a voltage is applied across the conductor, its charge carriers will behave in a certain direction, thus generating a current. Conductivity is defined by Ohm's law as the ratio of current density to electric field strength: some materials have an anisotropic conductivity and must be expressed in a 3 X 3 matrix (using mathematical terms, second order tensors, usually Is symmetrical). Conductivity is the reciprocal of resistivity. The unit in the International System of Units is Siemens/S (m·m-1): An electrical conductivity meter is an instrument used to measure the conductivity of a solution. The measurement of conductivity is usually the conductivity measurement of the solution. The resistivity of a solid conductor can be measured by Ohm's law and the law of resistance. The conductivity of the electrolyte solution is generally measured by an alternating current signal applied to the two electrode plates of the conductivity cell, and the conductivity σ is obtained from the measured cell constant K and the conductance G between the two electrode plates. The first to be used in conductivity measurement is the AC bridge method, which directly measures the conductance value. The most commonly used instruments are provided with a constant regulator, a temperature coefficient regulator and an automatic temperature compensator. The primary meter is composed of a conductivity cell and a temperature sensor, which can directly measure the conductivity of the electrolyte solution.
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