• # question_answer Fluid flow rate Q, can be measured easily with the help of a venturi tube, in which the difference of two pressures, $\Delta \,P,$  measured at an upstream point and at the smallest cross-section of the tube, is used. If a relation $\Delta \,P\propto {{Q}^{n}}$ exists, then n is equal to: A) $\frac{1}{3}$                          B) $\frac{1}{2}$C) 1                                 D) 2

$Q\propto \sqrt{h}\,\,\,or\,\,\,h\propto {{Q}^{2}}$