An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) General: A measure of the ability to transmit, as electricity, thermal energy, sound, and so on.
2) → electrical conductivity.
3) → thermal conductivity.

From → conductive + → -ity suffix forming abstract nouns expressing state or condition.

A measure of a material's ability to conduct an electrical current. It is the reciprocal of the → resistivity. Conductivity is expressed by σ = ne²l/(2mv), where n is the number of electrons per cm³ volume of the → conductor, e is the → electron charge, l is the → mean free path, m is the → electron mass, and v is the arithmetic mean velocity of thermal motion of electrons at a given temperature.

→ electrical; → conductivity.

Photoconductivity due to the addition of impurities or external causes.

→ extrinsic; → photoconductivity.

Šidhâzandegi, → photoconductivity; borungin, → extrinsic.

The conductivity in a semiconductor caused by a flow of electrons, whereas p-type conductivity is caused by a flow of holes.

n standing for → negative; → type; → conductivity.

The phenomenon in which certain materials, when cooled to a sufficiently low temperature, lose all resistance to the flow of electricity.

→ super-; → conductivity

In → thermal conduction, the amount of heat passing across unit area per unit time and per unit → temperature gradient.

→ thermal; → conductivity.