Thermal Properties of Promethium and Thulium
Specific Heat
0.18 J/(kg K)
  
33
0.16 J/(kg K)
  
35
Molar Heat Capacity
Not Available
  
27.03 J/mol·K
  
22
Thermal Conductivity
17.90 W/m·K
  
99+
16.90 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
9.00 µm/(m·K)
  
99+
13.30 µm/(m·K)
  
29
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
191.00 kJ/mol
  
99+
Enthalpy of Fusion
7.50 kJ/mol
  
99+
16.80 kJ/mol
  
17
Enthalpy of Atomization
310.00 kJ/mol
  
34
247.00 kJ/mol
  
99+
Standard Molar Entropy
Not Available
  
74.00 J/mol.K
  
9