Re: Boiling

[Brian McInnes <bmcinnes@PNC.COM.AU>]

Brian Whatcott wrote a nice summary of the progress of thermometry.
Let me just touch it up with a couple of minor additions
> Reviewing the progress of thermometry like this:
> 1) a centigrade system between fixed points provided by a specified
> freezing mixture and mean human body core temperature (due to Fahrenheit)
> 2) a centigrade system between fixed points provided by the
> freezing point of pure water, and the boiling point of pure water
> at a pressure of 1 atm  (due to Celcius,
 with 0 as the boiling point and 100 as the freezing point)
2a) the centigrade scale as we know it: 100 as boiling point and 0 as
freezing point; due to Christin of Lyon.
> 3) a linearly divided scale with one physical fixed point which
> is very repeatable - the triple point of pure water, and a lower point
> which can be repeatably and closely approached, scaled so as to
> approximate as far as possible with a simple zero shift, an existing
> temperature scale in which many important results were
> historically expressed.
Brian McInnes