Q: Why does metres have to be metres and not any other unit?
A:Metres is used as it is internationally recogninsed thus it would avoid confusion.
Elaboration:Metre is the SI base unit of distance .Originally,the meter was designed to be one-tenth of a quadrant the distance between the equator and the north pole . For a long time ,the metre was precisely defined as the length of an actual object, a bar kept at the International Bureau of Weights and Measurements in Paris.In recent years,however,the SI base units (with one exception) have been redefined in abstract terms so they can be reproduced to any desired level of accuracy in a well equipped laboratory.
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