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If a centrifugal pump has an impeller speed of $N$ (in rpm), discharge $Q$ (in $m^3/s$) and the total head $H$ (in $m$), the expression for the  specific speed $N_s$ of the pump is given by

  1. $N_s = \dfrac{NQ^{0.5}}{H^{0.5}} \\$
  2. $N_s = \dfrac{NQ^{0.5}}{H}\\$
  3. $N_s = \dfrac{NQ^{0.5}}{H^{0.75}} \\$
  4. $N_s = \dfrac{NQ}{H^{0.5}}$
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