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[–] AndersonBlitzer ago 

supposedly imperial had advantages because it was easier to do sums in your head and divide into fractions quickly. it was better for buying and selling, shops etc. the fraction used are actually easier in some ways (I'm not sure how this works exactly, but for people who defend it, that's their argument)

the thinking behind fahrenheit is to avoid having to deal with minus numbers I think, that's why freezing is so high