thermal conductivity, \(\lambda\)

https://doi.org/10.1351/goldbook.T06299
Tensor quantity relating the heat flux, \(J_{q}\), to the temperature gradient, \(J_{q}=- \lambda \ \nabla T\).
Source:
Green Book,2nd ed., p. 37 (https://www.cintegrado.com.br/site/documentos/green_book_2ed.pdf)