Water boils once the temperature reaches 212 degrees Fahrenheit or 100 degrees Celsius. In contrast, water freezes at 32 F or 0 C.
By the end of the 20th century, many countries had switched over to the Celsius scale and strayed away from Fahrenheit for temperature measurement. However, countries like the U.S., the Bahamas, and Belize still rely on Fahrenheit. Today, even Canada uses Fahrenheit as a supplement to the Celsius scale.
On the Fahrenheit scale, boiling and freezing are exactly 180 degrees apart. Absolute zero is, on the Fahrenheit scale, -469.67 degrees.
To convert a number from Celsius to Fahrenheit, simply double the number and add 32. To covert from Fahrenheit to Celsius, subtract 32 from the temperature and halve the remaining number.