USA uses Fahrenheit, Great Britain uses Celsius
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Because Celsius is metric, and everybody in the world uses it. But then we in America made our own thing ( Fahrenheit ) and it's too late to go back.
United States is the ONLY country that uses Fahrenheit all the rest use Celsius.
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.
most countries use Celsius. the Fahrenheit metric was developed first but was deemed inappropriate in Europe during the 17th/18th centuries because it used a non-zero point for freezing of water. A centigrade scale was deemed more workable and was thus developed. The USA stuck with the original Fahrenheit system for some reason.
officially probably only USA would use both. no other country (with the possible exception of Liberia and Burma) officially uses Fahrenheit