Re: [boost] Boost Units library preview

From: Eric Lemings (lemings_at_[hidden])
Date: 2006-08-23 13:29:44

> -----Original Message-----
> From: Eric Lemings 
> Sent: Wednesday, August 23, 2006 10:24 AM
> To: 'boost_at_[hidden]'
> Subject: RE: [boost] Boost Units library preview
> 
>  
> 
> > -----Original Message-----
> > From: boost-bounces_at_[hidden]
> > [mailto:boost-bounces_at_[hidden]] On Behalf Of Phil Richards
> > Sent: Wednesday, August 23, 2006 8:58 AM
> > To: boost_at_[hidden]
> > Subject: Re: [boost] Boost Units library preview
> > 
> > On 2006-08-23, Matthias Troyer <troyer_at_[hidden]> wrote:
> > >  - Nm would be a "dimension"
> > 
> > Not really.  It is the unit.
> 
> Correct.  A newton is a derived unit composed of base units, 
> specifically kilogram, meter, and second.  Meter is of course 
> a base unit.
> 
> > The dimension is: MASS * LENGTH^2 * TIME^2
> 
> Also correct.  Every unit, whether a base unit or derived, 
> has a corresponding dimension.
> 
> > >  - 1 Nm would be a "quantity"
> 
> No.  This is a measure.  It has a specific unit and a specific value.
> 
> Here's an example of a quantity.  The distance from
> here->|                        |<-to here is a quantity with a

Well there is supposed to be a lot more whitespace between those
vertical bars.  Let's try a quantity of horizontal length.

>From here
-------------------------

-------------------------
to here.

Hopefully that will appear as a significant distance.

Eric.