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  Common zero points of ∇ρ and the total currents are exactly zero points of the mechanical momentum density.We investigate the liquid, gas, and supercritical fluid phases of a Lennard-Jones 12-6 potential system by a two-dimensional ****-exchange method in which not only temperature but also chemical potential is exchanged. The method is referred to as the grand canonical ****-exchange method (GCREM). While one-dimensional **** exchange, which exchanges only temperature, cannot cross first-order phase transition points, GCREM can
 
					 
						 
                                     
				    				