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Pressure and depth

larger reach is more pressure

From the above video, we learn that the pressure which produces the water jets is larger at the lower pipe of the vessel than at the higher ones, since it reaches a larger horizontal distance from the vessel.

In general we may conclude that any object at a certain depth below the surface of a lake (sea, river, ocean) experiences a hydrostatic pressure which is given by

P = P_air + depth×ρ_water×g

We have assumed here that the density of water ρ_water is the same at any depth. This is generally true for any incompressible fluid: liquids.

ideal gas law