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From: Fluid Mechanics with Engineering Applications, Robert L. Daugherty, and Joseph B. Franzini, pages 184- 189.
' a mathematical technique making use of the study of dimensions, making use of the study of dimensions, related to similitude, involving physical parameters that influence flow, and grouping these parameters in dimensionless combinations, allowing a better understanding of flow phenomena to be made possible.... particularly helpful in experimental work because it provides a guide to those things that significantly influence the phenomena.... indicating the direction in which experimental work should go.'