Fahrenheit is a system of measuring temperatures, and is most commonly used in the United States. It was named after the German-Dutch physicist Daniel Gabriel Fahrenheit (1686-1736), who proposed it in 1724. Using Fahrenheit, the freezing point of water is 32°, and the boiling point is 212°.

Celsius is named after the Swedish astronomer Anders Celsius. On the Celsius scale, 0° is defined as the melting point of ice and 100° is the boiling point. Most countries use the Celsius system.

If you are not familiar with Celsius temperatures, this rhyme might help:

You can change the temperature in Fahrenheit into Celsius using math. Take your number; subtract 32° from it; and divide the result by 1.8.

Example:

Change 70 degrees Fahrenheit into Celsius.

• 70 - 32 = 38
• 38 / 1.8 = 21.11° C
• So, 70° F is equal to 21.11° C

To change the temperature in Celsius to Fahrenheit using math, multiply your number by 1.8 and add 32°.

Example:

Change 10 degrees Celsius into Fahrenheit.

• 10 x 1.8 = 18
• 18 + 32 = 50° F
• So, 10° C is equal to 50° F