thermal conductivity, \(\lambda\)
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https://doi.org/10.1351/goldbook.T06299
Tensor quantity relating the heat flux, Jq, to the temperature gradient, Jq = -λ.∇.T.
Source:
Green Book, 2
nd
ed., p. 37 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)