How to calculate the energy flux density, for example,

Energy flux density is the energy or power of a certain energy that can be obtained per unit area (such as square meter) or produced per unit weight (such as kilogram) of energy in a certain space range. In electromagnetics, energy flux density refers to the energy that passes through the unit area perpendicular to the propagation direction in unit time
I think you should know how to calculate when you see this definition

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