The conductivity of water was first determined in 1839; the conductivity of gases was not measured until after 1860.
The conductivity of carbon nanotubes, by contrast, depends critically on size, shape and twistiness.
Impurities also can change the conductivity of a semiconductor dramatically by providing more free electrons.
Adding carbon fibre is, he says, an expensive way to increase the conductivity of concrete.
This behaviour is represented by Ohm's law: The proportionality constant σJ is the conductivity of the material.
It is also proportional to the conductivity of the medium between the evaporator and the free air.
"The conductivity of saltwater is much, much higher than that of freshwater because of all the salt," Mr. Abraham said.
Water and humidity negatively affect the conductivity of the copper cables, John Bonomo, a Verizon spokesman, explained.
The electric field at the gate alters the conductivity of a second part of the transistor called the channel.
The conductivity of a given metal is decreased by phenomena that deflect, or scatter, the moving electrons.
The conductivity of a semiconductor is generally sensitive to temperature, illumination, magnetic fields, and minute amounts of impurity atoms.
