$\definecolor{red}{RGB}{255,0,0}$$\definecolor{black}{RGB}{0,0,0}$
P
P
P
P
=
σ·ε·A ·(T
4
-T
i
4
)
A
A
A
A
=
P/(σ·ε·(T
4
-T
i
4
))
ε
ε
ε
ε
=
P/(σ·A ·(T
4
-T
i
4
))
T
T
T
T
i
T
i
T
i
: Radiation of the black body: Radiant area, temperature, emissivity
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→ Emissivities ( compared to the black body )
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