Thermal Properties of Protactinium and Promethium
Specific Heat
0.12 J/(kg K)
  
40
0.18 J/(kg K)
  
33
Molar Heat Capacity
Not Available
  
Not Available
  
Thermal Conductivity
47.00 W/m·K
  
32
17.90 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
9.90 µm/(m·K)
  
40
9.00 µm/(m·K)
  
99+
Enthalpy
  
  
Enthalpy of Fusion
12.34 kJ/mol
  
28
7.50 kJ/mol
  
99+
Enthalpy of Atomization
Not Available
  
310.00 kJ/mol
  
34
Standard Molar Entropy
198.10 J/mol.K
  
1
Not Available