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with 0 as the boiling point and 100 as the freezing point)
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,
3) a linearly divided scale with one physical fixed point whichBrian McInnes
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.