Physical Properties of Niobium and Copper
Melting Point
1,084.62 °C
  
40
Boiling Point
2,468.00 °C
  
99+
2,562.00 °C
  
99+
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Gray
  
Copper
  
Luster
Metallic
  
NA
  
Hardness
  
  
Speed of Sound
3,480.00 m/s
  
21
3,810.00 m/s
  
19
Optical Properties
  
  
Reflectivity
Not Available
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available