Thermal Properties of Promethium and Potassium
Specific Heat
0.18 J/(kg K)
  
33
0.75 J/(kg K)
  
6
Molar Heat Capacity
Not Available
  
29.60 J/mol·K
  
6
Thermal Conductivity
17.90 W/m·K
  
99+
102.50 W/m·K
  
15
Critical Temperature
Not Available
  
Thermal Expansion
9.00 µm/(m·K)
  
99+
83.30 µm/(m·K)
  
3
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
77.50 kJ/mol
  
99+
Enthalpy of Fusion
7.50 kJ/mol
  
99+
2.32 kJ/mol
  
99+
Enthalpy of Atomization
310.00 kJ/mol
  
34
89.50 kJ/mol
  
99+
Standard Molar Entropy
Not Available
  
64.70 J/mol.K
  
18