Question

What is the SI base unit for length?

Answer 1

`"The metre..........."`

Explanation:

And `1*mm-=10^-3*m`; and `1*cm-=10^-2*m`..........

Most of the time chemists use `"Angstroms"=1xx10^-10*m`, because typically bond lengths are `1-2` `"Angstroms"` long.