The median tectonic line is favored. Elutriation is a method of classifying powder samples based on the principle of particle size measurement. The counterflow acting in the opposite direction to the centrifugal force forms a gradient layer of excited states based on size and specific gravity in the chamber installed in the rotor of the centrifuge. By lowering the rotational speed, gradually increasing the flow velocity of the countercurrent flow, or changing the equilibrium position, particles with specific gravity or small particles flow out of the chamber and are collected as a fraction.

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