Convert F to C

Temperature uses an offset as well as a scale, so it is not a simple multiplication.

F to C conversion table

FC
0 F-17.777778 C
10 F-12.222222 C
20 F-6.6666667 C
25 F-3.8888889 C
37 F2.7777778 C
50 F10 C
100 F37.777778 C
200 F93.333333 C

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A helper, not a substitute for engineering judgment.