Thermal Properties of Promethium and Ytterbium
Specific Heat
0.18 J/(kg K)
  
33
0.15 J/(kg K)
  
36
Molar Heat Capacity
Not Available
  
26.74 J/mol·K
  
25
Thermal Conductivity
17.90 W/m·K
  
99+
38.50 W/m·K
  
35
Critical Temperature
Not Available
  
Thermal Expansion
9.00 µm/(m·K)
  
99+
26.30 µm/(m·K)
  
14
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
128.90 kJ/mol
  
99+
Enthalpy of Fusion
7.50 kJ/mol
  
99+
7.66 kJ/mol
  
99+
Enthalpy of Atomization
310.00 kJ/mol
  
34
180.00 kJ/mol
  
99+
Standard Molar Entropy
Not Available
  
59.90 J/mol.K
  
21