Energy density and mass flow product is related to concerning work done.
Mechanical system energy density = Work or Energy/mass= F*S/m =N-m/kg = J/kg= = m2/sec2 = classical velocity , V square of the massive body
EM system, energy density = energy/ involved mass= nearly light velocity square, C2 = m2/sec2. In electrical- electronic system it is drift velovity, Vd< C.
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