Opened 12 years ago

Closed 9 months ago

#55 closed enhancement (wontfix)


Reported by: Patrick Melo Owned by: Simon Cox
Priority: blocker Milestone:
Component: help Keywords:


Thank you so much for all the work you are doing. I found the documentation very useful. I had some difficulty, however, finding any documentation related to the unit "rpm" (revolutions per minute), as in the unit that might indicate the speed of a fan, for example. Can you suggest a reference in the specification that deals with this measurement?

Change History (9)

comment:1 Changed 11 years ago by Gunther Schadow

Status: newreject_proposed

frequency units are "/min", the fact that it is "revolutions" "rounds" or "rings" does not matter. This should not become a unit. I vote against.

comment:2 Changed 4 years ago by Garret Wilson

Component: help

Could someone indicate how one would indicate RPM using UCUM in that case? I understand the reasoning, but what goes in the "numerator" position with "/min"? What is the standard UCUM unit for a revolution? Surely it would not be "revolution/min", because I can't find "revolution" in the UCUM.

I want to do it the correct way. What is the correct way?

For lab equipment, for example, I believe it is common to set up some motors at a certain speed. It seems convoluted to ask the lab workers to learn how to convert a simple RPM to "2pi/60 rad/s" or whatever.

comment:3 Changed 19 months ago by Simon Cox

'Revolutions' is a 'count' quantity. There is no unit in the numerator for rpm. It is just /min or min-1.

comment:4 Changed 19 months ago by Brenée Mitchell

Status: reject_proposednew

comment:5 Changed 19 months ago by Brenée Mitchell

Owner: set to Simon Cox
Status: newassigned

comment:6 Changed 18 months ago by Simon Cox

Gunther - would {rev}/min be an acceptable workaround? (requires no change to UCUM, just guidance to the inquirer).

comment:7 Changed 17 months ago by Simon Cox

Or even /min{rev}

comment:8 Changed 9 months ago by Brenée Mitchell

Summary: rpm*rpm

comment:9 Changed 9 months ago by Brenée Mitchell

Resolution: wontfix
Status: assignedclosed
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