The equation relating friction factor to Reynold number, $${{\text{f}}^{ - 0.5}} = 4{\log _{\text{e}}}{\left( {\frac{{{{\text{N}}_{{\text{Re}}}}}}{{\sqrt {\text{f}} }}} \right)^{ - 0.4}},$$     is called the __________ equation.

Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid

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