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about measurement units of parameters in formula for specific energy of a pump

Dear colleagues,

I've check several sources about the formula of specific energy for the pumps.

According most of them in the formula the rotational speed is in revolutions per minute. rpm

But in the help documents of Hammer the rotational speed is in revolutions per second. rps

Something more: it seems that the software calculates with rpm...

Please could you comment this difference, is this only mistake in the help documentation?

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