Question

Why is a foot step or a hand spam not used as a standard unit of lenght.

Answer 1

Answer:

Handspan and cubit cannot be used as a standard unit of length . This is because these are not particular measurements . Like the handspan will vary from person to person and the true value would not be same . ... This is because the distance between them is very large and milimeters are a very small unit of length

Answer 2

foot step or a hand spam are not used as a standard unit of length because  cannot be used as a standard unit of length . This is because these are not particular measurements . Like the handspan will vary from person to person and the true value would not be same . ... This is because the distance between them is very large and milimeters are a very small unit of length .