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@thor
Well they were using pounds and then it suddenly shifted to metrics but ofcourse common folks won't catch up to the change fast and to avoid any deliberate fault in giving the true weight of items of business the British decided to keep the 'ton' as it is and introduce the new one as tonne
@thor
With no surprise, Unlike Britain, in USA & Canada a ton is equal to 907 Kg.
How did the Americans came up with this magic number?
Well the British Ton is 1016Kg or 2240 pounds (This makes sense as the imperial system works on multiples of 16).
But the Americans change it to 2000 pounds (well you it's easy to do maths with multiples of 10)
Now wonder why did USA didn't adopt metric even though it so much fucked up imperial system to adjust for multiples of 10 ??