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A different conversion rule which I, at least, find much easier to remember, and easier to calculate mentally
To convert a temperature in Fahrenheit to Celsius, subtract 32 and multiply the result by 5/9.
To convert a temperature in Fahrenheit to Celsius, subtract 32 and multiply the result by 5/9.
The temperature -40 is the same in both scales.
The temperature -40 is the same in both scales. This gives an alternative conversion rule: to convert in ''either'' direction, first add 40; then multiply by 5/9 for °F->°C or 9/5 for °C->°F; then subtract 40.
[[Ray Bradbury]] wrote a book called ''[[Fahrenheit 451]]'' about burning books in the future. According to Bradbury's research (which involved calling a local fire station on the telephone), 451°F is the temperature at which book paper burns.
[[Ray Bradbury]] wrote a book called ''[[Fahrenheit 451]]'' about burning books in the future. According to Bradbury's research (which involved calling a local fire station on the telephone), 451°F is the temperature at which book paper burns.
[[Category:Units of temperature]]
[[Category:Units of temperature]]