Both scales were developed in the early 18th Century.
The Fahrenheit scale was proposed by Daniel Fahrenheit. The freezing point of brine set the 0 point. 180 degrees separated the freezing point of water (32 degrees) from the boiling point (212 deg).
Anders Celsius introduced the Centigrade scale in which the freezing point was 0 deg and the boiling point was 100 degrees. Centigrade was later renamed Celsius.
The Celsius scale is the international standard, used by most countries and scientific communities in all countries. There are some countries, however, that have not fully adopted the Celsius scale, so the Fahrenheit scale remains in use today.
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160 Celsius = 320 Fahrenheit
68 degree celsius = 154.4 Fahrenheit
The Celsius scale has its 'zero' at the same temperature as 32 on the Fahrenheit scale, and each Celsius degree is the same size as 1.8 Fahrenheit degrees.
65 degrees Fahrenheit is 18.3 degrees Celsius.
(-400) degrees Fahrenheit = -240 degrees Celsius