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Energy flux is the rate of transfer of energy through a surface. The quantity is defined in two different ways, depending on the context:
# Total rate of energy transfer (not per unit area); SI units: W = J·s^-1.
# Specific rate of energy transfer (total normalized per unit area); SI units: W·m^-2 = J·m^-2·s^-1:
#* This is a vector quantity,

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