1{}^{0\!}\!/\!_{00}= \frac{1}{1000}=0,001=
1m=1000mm
1mm=0,001m
\frac{0,001}{0,001}=1{}^{0\!}\!/\!_{00}
…
1g=1000mg
1mg=0,001g
17mg=0,017g
\frac{0,017}{0,001}=17{}^{0\!}\!/\!_{00}
…
1kg=1000000mg
1mg=0,000001kg
17mg=0,000017kg
\frac{0,00017}{0,001}=0,017{}^{0\!}\!/\!_{00}
…
1l=1000ml
1ml=0,001l
20ml=0,020l
\frac{0,02}{0,001}=20{}^{0\!}\!/\!_{00}