Pressure in Liquid - Example 3

Example 3:
Find the pressure at a depth of 20 m in water when the atmospheric pressure is 100000 Pa. The density of water is 1000 kg/m³.

Answer:
(Caution: Pressure in liquid = Pressure caused by liquid + Atmospheric Pressure)

Depth, h = 20m
Density,  = 1000 kg/m³
Gravitational Field Strength, g = 10 N/kg
Atmospheric Pressure, P_atm = 100000 Pa

Pressure in water,
$$\begin{array}{l}P=h\rho g+P_{atm}\\ P=(20)(1000)(10)+(100000)\\ P=300000Pa\end{array}$$