ForNewton number, see alsoKissing number in thesphere packing problem.

Thepower numberN_p (also known asNewton number) is a commonly useddimensionless number relating theresistance force to theinertia force.

The power-number has different specifications according to the field of application. E.g., forstirrers the power number is defined as:^[1]

${\displaystyle N_{\mathrm{p}}=\frac{P}{\rho n^3{D}^5}}$

with

• P:power
• ρ:fluiddensity
• n:rotational speed in revolutions per second
• D:diameter of stirrer

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