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Power numberThe power number Np (also known as Newton number) is a dimensionless number relating the resistance force to the inertia force. In engineering, this number, along with the Reynolds number, is one of the most widely employed dimensionless numbers.The power-number has different specifications according to the field of application. E.g., for stirrers the power number is defined as:
with 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Power number".