references:
  - J.G. Hust and A.B. Lankford,
    Thermal Conductivity of Aluminum, Copper, Iron, and Tungsten from 1K to the Melting Point,
    US Department of Commerce, Boulder, Colorado, 1984,
    fit to Tab. 2.4.1 (RRR=300, T_min=150K, T_max=1000K)
  - https://www.mit.edu/~6.777/matprops/copper.htm

output: [T]

K_11: 4.005e+2
K_11,T: -1.075e-1
K_11,T^2: 3.293e-4
K_11,T^3: -7.533e-7
K_11,T^4: 5.223e-10

T_ref: 293.15

C_p: 385.0