Question: Q = A epsi sigma ( Tsurface ^ 4 ) vs Q = A epsi sigma ( Tsurface ^ 4 -

=

\

epsi

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sigma

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Tsurface

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=

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epsi

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sigma

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Tsurface

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Tsurroundings

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Different between the two radiation heat transfer formula and when to use them, they are both heat flux right, why are there two different formulas and what different context are they used

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