Determine the height of the water tower if the pressure at its base is 40 kPa.

Let’s give the data to us in the SI system:
P = 40 kPa = 40,000 Pa.
The hydrostatic pressure inside the liquid at any depth does not depend on the shape of the vessel in which the liquid is located, and is equal to the product of the density of the liquid, the acceleration of gravity and the depth at which the pressure is determined:
P = ρ * g * h, where ρ is the density of the liquid, g is the free fall acceleration of a body raised above the Earth g = 9.8 m / s2, h is the depth of immersion in the liquid.
Let us express the height of the liquid column from this expression:
h = P / ρ * g
Density of liquid according to the reference book density of water ρ = 1000 kg / m³.
Substitute the numbers and find the height of the pillar:
h = P / ρ * g = 40,000 / (1000 * 9.8) = 4 m.
Answer: the height of the water tower is 4 m.