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In this paper, the relativistic fluids with the negligible magnetic field inthe flat metric are studied. The iso-dimension scale in introduced, in thisscale, all similar components of a variable have the same dimension. Also, thecomponents of shear, bulk and heat flux tensors and the components ofenergy-momentum tensors are calculated in the cylindrical and sphericalcoordinate systems, all these components are derived in the iso-dimensionscale. The non-relativistic shear, bulk and heat flux tensors and thecomponents of energy-momentum tensor are derived in the limit of therelativistic fluids. Also, the connection of relativistic and non-relativisticfluids are seen. So, some distinctions of relativistic and non-relativisticfluids are displayed, for example in the relativistic fluids, the timederivative of velocity is created the shear stress tensor and derivative ofvelocity and temperature is created the heat flux energy-momentum tensor, etc.

Energy-momentum tensor of special relativistic fluids and Connection of relativistic and non-relativistic fluids in the new scaling