Determining Relations of Power Product of Physical Quantities by Generalized Relation

We determine the relations of power product of physical quantities (PQs) by the generalized relation. Assuming the relations with two, three and four PQs to generalized relation separately, we find the corresponding general formulas. By ordering the exponent of physical constant in relations being zero or fit number, we gain many famous equations without factors such as mass-energy relation, formula of event horizon temperature of Schwarzschild black hole (SBH), equation of holographic dark energy (HDE) model, Casimir effect equation, Planck black body radiation formula, Stefan-Boltzmann law, Einstein field equation, Newtonian attraction law, Schrödinger equation, Coulomb law, Newtonian second law, Clapeyron equation, formula of superconducting thin film, centrifugal force formula, etc. Some new relations are given including square of total energy with energy density of HDE, square of energy with its density of SBH, energy density with sextic radii of SBH, pressure in SBH centre and entropy density of SBH center. We show that the generalized relation can determine the relations of power product of two, three and four PQs, it is useful and significant.