[tex]\rho=700 \ kg/m^3 \\ p=21 \cdot10^4 \ Pa=210000 \ Pa \\ \boxed{h-?} \\ \bold{Rezolvare:} \\ \boxed{p=g \cdot h \cdot \rho} \\ \Rightarrow h= \frac{p}{g \cdot \rho} \\ h= \frac{210000 \ Pa}{700 \ kg/m^3 \cdot 10 \ N/kg} = \frac{210000 \ Pa}{7000 \ N/m^3} \\ \Rightarrow \boxed{h=30 \ m}[/tex]
