Thermal Properties of Promethium and Thorium
Specific Heat
0.18 J/(kg K)
  
33
0.12 J/(kg K)
  
40
Molar Heat Capacity
Not Available
  
26.23 J/mol·K
  
30
Thermal Conductivity
17.90 W/m·K
  
99+
54.00 W/m·K
  
28
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
9.00 µm/(m·K)
  
99+
11.00 µm/(m·K)
  
36
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
429.00 kJ/mol
  
15
Enthalpy of Fusion
7.50 kJ/mol
  
99+
15.48 kJ/mol
  
19
Enthalpy of Atomization
310.00 kJ/mol
  
34
468.60 kJ/mol
  
15
Standard Molar Entropy
Not Available
  
27.30 J/mol.K
  
99+