1. Molar Heat Capacity of Cu
Ѳ= 240 K
Fit uses Einstein vibrational frequency of 5 x 1012 s-1
Cv  T3
Temp (K)
Fig. 9.1 from D. Tabor, Gases, Liquids and Solids (1991) Cambridge Univ Press.

2. Comparisons of Molar Heat Capacity for Several Metals
● = Ag; ѲD = 215 K
 = Pb; ѲD = 88 K
X = C; ѲD = 1860 K
Ο = C; ѲD = 315 K
Fig. 9.4 from D. Tabor, Gases, Liquids and Solids (1991) Cambridge Univ Press.

3. Molar heat capacities of various gases at 25 °C
From Tipler’s Physics

4. Molar Heat Capacity of Iron
Cv ~ T3
From Tipler’s Physics