“conduction”的概念、定义、翻译、参考文献-科学参考

conduction

Physics

1. (thermal conduction) The transmission of heat through a substance from a region of high temperature to a region of lower temperature. In gases and most liquids, the energy is transmitted mainly by collisions between atoms and molecules with those possessing lower kinetic energy. In solid and liquid metals, heat conduction is predominantly by migration of fast-moving electrons, followed by collisions between these electrons and ions. In solid insulators the absence of free electrons restricts heat transfer to the vibrations of atoms and molecules within crystal lattices. See conductivity.

2. (electrical conduction) The passage of electric charge through a substance under the influence of an electric field. See also charge carrier; energy bands.

Chemical Engineering

A mode of heat transfer in which thermal energy is transmitted through a substance from a region of high temperature to a region of lower temperature. Within gases (p. 77) and liquids, the thermal energy is by collisions between atoms and molecules to those with lower kinetic energy. The rate of heat transfer for steady-state thermal conduction through a slab is given by Fourier’s law:
$q = \frac{k A}{x} Δ T$

where q is the rate of heat transfer, k is the thermal conductivity, x is the thickness of material, A is the area perpendicular to the direction of heat flow, and ΔT is the temperature difference along the path of heat transfer.

Electronics and Electrical Engineering

The transmission of electric (or heat or acoustic) energy through a substance that does not itself move. In electrical conductors, such as metals, it entails the migration of electrons; in gases and solids it results from the migration of ions. See also hole conduction.

单词	conduction
释义	conduction Physics 1. (thermal conduction) The transmission of heat through a substance from a region of high temperature to a region of lower temperature. In gases and most liquids, the energy is transmitted mainly by collisions between atoms and molecules with those possessing lower kinetic energy. In solid and liquid metals, heat conduction is predominantly by migration of fast-moving electrons, followed by collisions between these electrons and ions. In solid insulators the absence of free electrons restricts heat transfer to the vibrations of atoms and molecules within crystal lattices. See conductivity. 2. (electrical conduction) The passage of electric charge through a substance under the influence of an electric field. See also charge carrier; energy bands. Chemical Engineering A mode of heat transfer in which thermal energy is transmitted through a substance from a region of high temperature to a region of lower temperature. Within gases (p. 77) and liquids, the thermal energy is by collisions between atoms and molecules to those with lower kinetic energy. The rate of heat transfer for steady-state thermal conduction through a slab is given by Fourier’s law: $q = \frac{k A}{x} Δ T$ where q is the rate of heat transfer, k is the thermal conductivity, x is the thickness of material, A is the area perpendicular to the direction of heat flow, and ΔT is the temperature difference along the path of heat transfer. Electronics and Electrical Engineering The transmission of electric (or heat or acoustic) energy through a substance that does not itself move. In electrical conductors, such as metals, it entails the migration of electrons; in gases and solids it results from the migration of ions. See also hole conduction.
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