Imagine that a tank is filled with water. The height of liquid column is 7 meters and the area is 1.5 square meters (m2). What's the force of gravity acting on the column of water?

- - The volume of water is (1.5 m² x 7 m) = 10.5 m³

10.5 m³ = 10,500 liters

Water mass = (10,500 liters) x (1 kg/liter) = 10,500 kg.

- - "Force of gravity on the water"

= Weight of the water = (10,500 kg) x (9.8 m/s²) = 102,900 newtons

- - Pressure on the bottom of the tank =

(102,900 newtons) / (1.5 m²)

= 68,600 nt/m² = 68,600 pascal.