How do you find the water pressure at the bottom of the 55-m-high water tower?

- - What's the volume of a cylinder with radius=1m and height=55m?

(Volume of a cylinder = π R² h)

- - How much does that volume of water weigh?

1 liter of water = 1 kilogram of mass

Weight = (mass) x (acceleration of gravity)

- - What's the area of the bottom of that 1m-radius cylinder?

Pressure = (force) / (area)