Thus, a pressure gauge attached to the bottom of the vessel holding a 12 foot column of this oil
would register 3.33 PSI. It is possible to customize the scale on the gauge to read directly in feet of
oil (height) instead of PSI, for convenience of the operator who must periodically read the gauge.
Since the mathematical relationship between oil height and pressure is both linear and direct, the
gauge’s indication will always be proportional to height.