Four degrees Celsius is 40 Fahrenheit, and 40 Celsius is 104 Fahrenheit. So if you're on vacation and you hear it’s going to be 32 today, you know that that’s more than 28 (82 Fahrenheit) but ...

Conversion between the two systems isn’t hard, but it does require some thought, and you won’t always be able to do it in your head. When converting Celsius to Fahrenheit, the formula is: (°C ...