Question

1)why don't we follow handspan for lenght measurements?​

Answer 1

Answer:

Hand span and cubit are not used as standard units of length because their sizes vary from person to person. So, two different persons may give different measurements for the same length, which is not desirable for a standard unit.

Hope it helps :D

Answer 2

$\huge\mathfrak\purple{Answer}$

We don't follow handspan for length measurements because it is not accurate.

Different people may give different measurements for the same length, which is not desirable for a standard unit.