Thermal Properties of Protactinium and Niobium
Specific Heat
0.12 J/(kg K)
  
40
0.26 J/(kg K)
  
20
Molar Heat Capacity
Not Available
  
24.60 J/mol·K
  
99+
Thermal Conductivity
47.00 W/m·K
  
32
53.70 W/m·K
  
29
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
9.90 µm/(m·K)
  
40
7.30 µm/(m·K)
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
696.60 kJ/mol
  
4
Enthalpy of Fusion
12.34 kJ/mol
  
28
27.20 kJ/mol
  
6
Enthalpy of Atomization
Not Available
  
745.00 kJ/mol
  
4
Standard Molar Entropy
198.10 J/mol.K
  
1
36.40 J/mol.K
  
99+