What is the SI base unit for length? Chemistry Measurement SI System of Measurement 1 Answer anor277 Dec 3, 2016 #"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. Answer link Related questions How do you convert SI units? What are the SI units? How many base SI units are there? What SI units are used to measure power? What SI units are used to measure density? What SI units are used to measure volume? Why are SI units helpful? What units of measurement are shown on a measurement are shown on a metric ruler? What is the importance of having a standard method of measurement such as the SI system? Is the SI unit for volume, liter, equivalent to a meter cubed? See all questions in SI System of Measurement Impact of this question 6363 views around the world You can reuse this answer Creative Commons License