Thermal Conductivity

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Thermal Conductivity

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An intrinsic physical property of a substance, describing its ability to conduct heat as a consequence of molecular motion. The thermal conductivity bears the same relation to the conduction of heat as the dynamic viscosity does to the transfer of momentum. It can be defined by reference to the Newton

law of cooling:
H = -k ( Missing Image:img src="SP7_t_files/partderiv.gif"T / Missing Image:img src="SP7_t_files/partderiv.gif"N )

where k is the thermal conductivity; H the rate of heat conduction across a surface per unit area and per unit time; and Missing Image:img src="SP7_t_files/partderiv.gif"T / Missing Image:img src="SP7_t_files/partderiv.gif"N the temperature gradient normal to the surface. Also called heat conductivity, coefficient of thermal conduction, coefficient of heat conduction. [[/a>|/a>]] </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use