moi621 (imported) wrote: Fri May 13, 2011 10:34 pm
And then let's not forget THEIR Centigrade temperature. <the horror>
100 degrees is a hot day in L.A.

Not the boiling point of water.
Moi
rage against metric!
got something better to rage against?
In 1742, the Swedish scientist Andres Celsius set the freezing point of water at 100 and boiling a 0; outside of Sweden, people thought that it was more reasonable to measure heat instead of cold and inverted the scale. Ten years later, Gabriel Fahrenheit (1753), made a better thermometer (nearly twice as accurate as Celsius's). Fahrenheit realized that things could be colder than ice and wanted to set his zero at the coldest possible temperature and was able in his lab to achieve a temperature 32 of his finer degrees below frozen water (or about -17.77777 C) with a mixture of water, alcohol, and ammonium chloride. His original plan was to set 100 at human body temperature (the inverted centigrade scale places it at 37 C), but it has since been recalculated at 98.6 F. About thirty years later, Reaumur (1782) created an even less accurate thermometer with freezing water at 0 and boiling at 80 degrees R. Lord Kelvin kept the less precise centrigrade intervals but returned in 1908 to Fahrenheit's original conception of setting zero at the lowest possible temperature, which he now considered the theoretical limit set by the gas laws, -273.16 degrees C, so water boils at 373.16 K. Some people still honor Fahrenheit's original genius and technical superiority with Absolute temperatures that also set zero at the same thermodynamic limit, but retain Fahrenheit's more precise and finer scale, so that 0 on the Absolute scale is -459.67 F and water boils at 671.67 A rather than a mere 373.16 K. I think it is a shame that Fahrenheit's genius and technical competence have been downplayed.