Thermal Properties of Promethium and Niobium
Specific Heat
0.18 J/(kg K)
  
33
0.26 J/(kg K)
  
20
Molar Heat Capacity
Not Available
  
24.60 J/mol·K
  
99+
Thermal Conductivity
17.90 W/m·K
  
99+
53.70 W/m·K
  
29
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
9.00 µm/(m·K)
  
99+
7.30 µm/(m·K)
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
696.60 kJ/mol
  
4
Enthalpy of Fusion
7.50 kJ/mol
  
99+
27.20 kJ/mol
  
6
Enthalpy of Atomization
310.00 kJ/mol
  
34
745.00 kJ/mol
  
4
Standard Molar Entropy
Not Available
  
36.40 J/mol.K
  
99+