77
Appendix
Emissivity table
Material
Temperature
(
°C
)
Emissivity
approximation
Metal
Aluminum
Polished aluminum
100
0.09
Commercial aluminum
foil
100
0.09
Electrolytic
chromeplate alumina
25
~
600
0.55
Mild alumina
25
~
600
0.10
~
0.20
Strong alumina
25
~
600
0.30
~
0.40
Brass
Brass mirror (highly
polished)
28
0.03
Brass oxide
200
~
600
0.61
~
0.59
Chrome
Polished chrome
40
~
1090
0.08
~
0.36
Copper
Copper mirror
100
0.05
Strong copper oxide
25
0.078
Cuprous oxide
800
~
1100
0.66
~
0.54
Liquid copper
1080
~
1280
0.16
~
0.13
Gold
Gold mirror
230
~
630
0.02
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