An easy conversion to remember is: Fahrenheit to Celsius: Subtract 30 and divide by 2. Celsius to Fahrenheit: multiply by 2 and add 30.
(For exact conversions: Fahrenheit to Celsius : subtract 32 and
divide by 1.8. Celsius to Fahrenheit : Multiply by 1.8 and add 32)
During 1742, Swedish astronomer Anders Celsius
created a temperature scale which was the reverse of the scale now
known as Celsius: 0 represented the boiling point of water, while
100 represented the freezing point of water. His scale was
reversed in 1744. For scientific use, Celsius is the term
usually used, with centigrade in common, but decreasing use.
Fahrenheit is a temperature scale based on one proposed in 1724 by
the German physicist Daniel Gabriel Fahrenheit. The scale is usually
defined by two fixed points: the temperature at which water freezes
into ice, 32 degrees, and the boiling point of water, 212 degrees.
Today, the Fahrenheit scale is used primarily in the United States
and some Caribbean countries. The rest of the world uses the Celsius
scale. It does not matter which scale you use at this time of
year where I live, it is just called HOT! In Antarctica it is