The second calibration point was 32 deg F, by definition the same as 0 deg C. It is kind of silly to only have two calibration points both for cold temperatures, which means that you will have to extrapolate your thermometer scale. The third one was not very reproducible (96 deg F = body temperature, not 100 deg F) and it would have been a great coincidence anyway if that third point happened to be at a nice round or divisible number.
(Score: 3, Informative) by hankwang on Friday March 14 2014, @02:08PM
That's an ice-salt mixture and actually not so bad in terms of reproducibility: a mixture of ice, water, and ammonium chloride, a salt, at a 1:1:1 ratio. This is a frigorific mixture which stabilizes its temperature automatically: that stable temperature was defined as 0 deg F [wikipedia.org]
The second calibration point was 32 deg F, by definition the same as 0 deg C. It is kind of silly to only have two calibration points both for cold temperatures, which means that you will have to extrapolate your thermometer scale. The third one was not very reproducible (96 deg F = body temperature, not 100 deg F) and it would have been a great coincidence anyway if that third point happened to be at a nice round or divisible number.
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