My sale or swap list (Update)

Brent Hilpert hilpert at
Tue Jun 12 15:53:57 CDT 2007

der Mouse wrote:
> >> 1000kg/m^3 is approximately the density of water: one gram per
> >> millilitre.
> > Precisely, even, if memory serves.  I believe that the kilogram is
> > defined as the weight of one litre of water at a certain pressure and
> > temperature.
> Well, it'd be the *mass* of, not the *weight* of.  But that aside, I
> thought the kilogram was still defined as the mass of a certain piece
> of metal kept at the BIPM in Sèvres?  Wikipedia certainly thinks so
> (see

I believe that definition (piece of metal) is more recent, while the original
definition from the 1700-or-1800s was
 1 litre    = volume of 1 cubic decimetre
 1 kilogram = mass of 1 litre of water at STP

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