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Non-equilibrium and equilibrium thermodynamics of an interacting component ina special-relativistic multi-component system is discussed by use of an entropyidentity. The special case of the corresponding free component is considered.Equilibrium conditions and especially the multi-component Killing relation ofthe 4-temperature are discussed. Two axioms characterize the mixture:additivity of the energy momentum tensors and of the 4-entropies of thecomponents generating those of the mixture. The resulting quantities of acomponent and of the mixture, energy, energy flux, momentum flux, stresstensor, entropy, entropy flux, supply and production and their Newtonian limitsin zeroth approximation are derived.

Entropy Identity inducing Non-Equilibrium Thermodynamics of Relativistic Multi-Component Systems and their Newtonian Limits