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Conductivity of any substance is measured by inducing an electric charge or power supply of some sort with known quantity on one side of the time and measuring the resulting charge, if any exists, after the charge flows through the substance.

If you picture a straight wire strand of gold, we induce a known charge on the left side of the wire, then measure the resulting charge on the right side of the wire.

This is also how a basic ohm-meter works. By placing two leads on either side of the wire, a circuit is formed using the meter and the connection point. One of the ohm-meter leads induces a small charge, the other reads the result. Using Ohms law (E=IR or V=IR, which is electro-magnetic force equals current * resistance, or voltage), the meter displays the amount of resistance in the circuit of substance.

The higher the amount of the electric charge to pass through, the less resistance the substance has. The lower the amount of charge led to pass through, the more resistance. Infinite resistance defines insulators, while minimal resistance defines conductors.

Once resistance is known, conductivity is a factor of both the resistance of the material and the size of the material used, or o = l/RA. l is the length of the sample (in meters), R is the resistivity (in ohms) and A is the area of the sample (in square meters). This will give us the conductivity o (in ohm meters^-1). The official unit of measure for electrical conductance is the siemens (S) which is defined as an inverse ohm (ohm^-1).

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