[tex]1 \ km=100 \ dam; \\ 1 \ km^2=100 \ dam \cdot 100 \ dam=10 \ 000 \ dam^2; \\ 1 \ km^3=100 \ dam \cdot 100 \ dam \cdot 100 \ dam=1\ 000 \ 000 \ dam^3; \\ \Rightarrow 1 \ dam^3=0,000\ 001 \ m^3=10^{-6} \ m^3; \\ \Rightarrow\boxed{ 19 \ dam^3=0,000 \ 019 \ km^3}[/tex]
