Celcius and Fahrenheit are the two main measures of temperature used around the world.

Celsius is used in most of the world. The melting point of water is 0 °C and the boiling point is 100 °C.

Fahrenheit is used primarily in the United States. The melting point of water is 32 °F and the boiling point is 212 °F.

The formula for converting Celcius to Fahrenheit is F=9/5C+32. To convert from Celcius to Fahrenheit, first multiply by 9, then divide by 5, then add 32. To convert from Fahrenheit to Celcius, first subtract 32, then divide by 9, then multiply by 5.