2.
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SI'da temel birim metredir(m).
1 Yottametre (Ym) = 10'24 m (x'y: x üzeri y)
1 Zettametre (Zm) = 10'21 m
1 Egzametre (Em) = 10'18 m
1 Petametre (Pm) = 10'15 m
1 Terametre (Tm) = 10'12 m
1 Gigametre (Gm) = 10'9 m
1 Megametre (Mm) = 10'6 m
1 Kilometre (km) = 10'3 m
1 Hectometre (hm) = 10'2 m
1 Dekametre (dam) = 10'1 m
1 Metre (m) = 10'0 m
1 Desimetre (dm) = 10'-1 m
1 Santimetre (cm) = 10'-2 m
1 Milimetre (mm) = 10'-3 m
1 Mikrometre (µm) = 10'-6 m
1 Nanometre (nm) = 10'-9 m
1 Pikometre (pm) = 10'-12 m
1 Femtometre (fm) = 10'-15 m
1 Attometre (am) = 10'-18 m
1 Zeptometre (zm) = 10'-21 m
1 Yoktometre (ym) = 10'-24 m
