Thermal Properties of Polonium and Promethium
Specific Heat
0.12 J/(kg K)
  
40
0.18 J/(kg K)
  
33
Molar Heat Capacity
26.40 J/mol·K
  
28
Not Available
  
Thermal Conductivity
20.00 W/m·K
  
99+
17.90 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
23.50 µm/(m·K)
  
16
9.00 µm/(m·K)
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
60.30 kJ/mol
  
99+
Not Available
  
Enthalpy of Fusion
13.00 kJ/mol
  
26
7.50 kJ/mol
  
99+
Enthalpy of Atomization
134.00 kJ/mol
  
99+
310.00 kJ/mol
  
34
Standard Molar Entropy
Not Available
  
Not Available