Thermal conductivity is the positive material coefficient in Fourier's law. It may depend on temperature, composition, and direction.
Thermal diffusivity is , the ratio of thermal conductivity to volumetric heat capacity. It sets the diffusion length over time .
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Thermal conductivity is a physical property of a material that measures its ability to conduct heat. It quantifies how well heat energy can transfer through a material when there is a temperature gradient. Materials with high thermal conductivity can quickly transfer heat, while those with low thermal conductivity are better insulators.