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Subject: Re: [office-formula] Straw poll - slug


On Tue, 2010-04-06 at 09:31 -0600, David A. Wheeler wrote:
> >Can we have a straw pool on slug?
> > Show of hands for:
> > 1)  "sg" : slug, 32.174 international pound mass (avoirdupois)
> > or
> > 2) 1 slug = 1 lbf * sec2 / ft
> 
> I have a minor preference for #2, in part because there is no question it's exact, and in part
> because there is no question that it's correct.  Definition #1 should only be used if it is *exact*,
> and that calculation needs to be shown in the JIRA comment (and maybe the document itself).

This also raises another question: For some units we say "exactly..."
for others we don't.

We say "Light-year, the distance light travels in a year of 365.25 days"
which isn't exact at all (we probably mean in vacuum...). 
> 


Andreas



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