Question

what is the smallest unit of length

Answer 1

The smallest unit of length is millimeter.
It is equal to 1/1000 of 1 metre.


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Answer 2

The smallest unit of length is millimeter (sometimes spelled as millimetre).  

  Millimeter is the smallest unit of length that is represented as ‘mm’.  It is directly related to other units of length like meter and kilometer.  

  The relation between mm and m is;

                      1 meter = 1000 millimeter  

                1 kilometer = 1000000 millimeter

  Hence we can convert the mm to m and km easily with the help of these units.