Question

Pressure is often measured in units of atmosphere. To what depth must you swim to experience 3.0 atm pressure?

Answer 1

$$P=\rho gh,$$ $$h=\dfrac{P}{\rho g}=\dfrac{3\ atm\times\dfrac{101325\ Pa}{1\ atm}}{1000\ \dfrac{kg}{m^3}\times9.8\ \dfrac{m}{s^2}}=31\ m.$$