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A Fahrenheit degree is smaller than a Celsius (Centigrade degree, one Fahrenheit degree being 5/9 of a Celsius degree.
To convert Fahrenheit degrees into Celsius, subtract 32, multiply by 5, and divide by 9.
To convert Celsius into Fahrenheit, multiply 9, divide by 5, and add 32.
The freezing point of water is 32° F, 0° C. The boiling point is 212° F, 100° C.