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5CCG (5th MOB):
Hobby & Fun
Airplanes and Rockets:
|Where:||P (watts) is the radiated power from a body of area A (m2),
at temperature T (K).
ε is emissivity, a dimensionless number between 0 and 1 that determines the
efficiency of a body to radiate and absorb energy. A black body has an emissivity
of 1. Soil, asphalt and human skin have emissivity of about 0.95. The emissivity of
the clear night sky is approximately 0.74 at 0 °C.
σ is the Stefan-Boltzmann constant, 5.67x10−8 Wm−2T−4