17-468

form factor (between two surfaces S1 and S2) [f12; f21]

ratio of the average radiant flux or luminous flux density, Φ2/A2 (or Φ1/A1), received over surface S2 (or S1) from surface S1 (or S2) to the radiant exitance or luminous exitance, M1 (or M2), of surface S1 (or S2)

 

       

 

where Φ2 (or Φ1) is the radiant flux or luminous flux received over surface S2 (or S1) from surface S1 (or S2), A2 (or A1) is the area of surface S2 (or S1) and g is the (mutual) exchange coefficient

Unit: 1

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