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