"Ted" wrote:
>What an interesting page!

Yes it is.

You may also be interested in the webpage of the source for all SI
definitions. It is the BIPM in Paris:

http://www.bipm.fr/enus/3_SI/base_units.html

"The kelvin, unit of thermodynamic temperature, is the fraction
1/273.16 of the thermodynamic temperature of the triple point of
water."

If you look at the BIPM web page and go to 'Brief history of the SI'
and then 'Temperature scales' you can read lots of detail.