Discussion
At what temperature (in Fahrenheit) pure water freezes?
Answer: C
Pure water freezes at 32 °F.
\[F = \frac{9}{5}C + 32 = \frac{9}{5}(0) + 32 = 32\] Fahrenheit set zero at the temperature of a brine mixture, which is why the freezing point of water falls at 32 rather than at 0 on his scale.
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