Question

What is the standard unit of length? Where it is kept? Where in India is it's copy kept?

Answer 1

Answer:

our standard unit of measure for length in the U.S. is miles, and in the rest of the world, it is kilometers. On a smaller scale, such as measuring the length of a pen, we use inches in the U.S. and centimeters in the rest of the world. Other U.S. measurements that we use for length are feet and yards.