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Physical Properties of Cobalt and Potassium

Cobalt
Potassium
Physical Properties of Potassium and Cobalt


Physical Properties
Melting Point
1,495.00 °C   
29
63.65 °C   
99+
Boiling Point
2,870.00 °C   
34
774.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Silvery Gray   
Luster
Metallic   
NA   
Hardness
  
  
Mohs Hardness
5.00   
8
0.40   
23
Brinell Hardness
470.00 MPa   
26
0.36 MPa   
99+
Vickers Hardness
1,043.00 MPa   
11
Not Available   
Speed of Sound
4,720.00 m/s   
14
2,000.00 m/s   
99+
Optical Properties
  
  
Reflectivity
67.00 %   
11
Not Available   
Allotropes
Yes   
No   
α Allotropes
α-Cobalt   
Not Available   
β Allotropes
β-Cobalt   
Not Available   
γ Allotropes
Not Available   
Not Available   
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