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