As I don't know the source for any of the density values, it's hard to
specify what the difference is due to. This could just be a refinement
on the measurement such as improvements in purity, precision, or
densification.

The other possibility is that the  measurements could have been carried
out at different temperatures. The coefficient of thermal expansion for
gold is 14.2ppm per degree C. Fifty degrees' difference would change
the volume enough to account for the discrepancy.

Chris

On Friday, November 1, 2002, at 08:05  pm, Wayne Seguin wrote:

> The Materials list for Material: Gold (Au), bulk shows a Density of
> 19280 kg/m^3, but I've found many other references that claim the
> Density is 19320 kg/m^3. (one example:
> http://www.stanford.edu/~yueliang/constant.htm)
> Does anyone know what the difference is between the two? (please don't
> say 40kg).
> Thanks
> Wayne
--
Christopher F. Blanford
Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK
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