79
Appendix
Emissivity table (continue)
Material
Temperature
(
°C
)
Emissivity
approximation
Lead
Pure lead (Non-
oxidization)
125
~
225
0.06
~
0.08
Mildly oxidized
25
~
300
0.20
~
0.45
Magnesium
Magnesia
275
~
825
0.55
~
0.20
Magnesia
900
~
1670
0.20
Hg
0
~
100
0.09
~
0.12
Nickel
Electroplate polishing
25
0.05
Electroplate
20
0.01
non-polishing
Nickel wire
185
~
1010
0.09
~
0.19
Nickel plate (oxidized) 198
~
600
0.37
~
0.48
Nickel oxide
650
~
1255
0.59
~
0.86
Nickel alloy
Nickel-chrome (heat-
resistance) alloy wire
(shining)
50
~
1000
0.65
~
0.79
Nickel-chrome alloy
50
~
1040
0.64
~
0.76
Nickel-chrome
(heat
resistance)
50
~
500
0.95
~
0.98
Nickel-silver alloy
100
0.14
Silver
Polished silver
100
0.05
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