What happens to psi when you double the water column height while keeping it constant?

When you double the height of the water column, the pressure measured in psi (pounds per square inch) at the base of the water column also doubles. This relationship is based on the fundamental principle that pressure in a fluid column is directly proportional to the height of the fluid above the point of measurement.

In this context, pressure at a specific depth in a fluid is derived from the formula:

[ \text{Pressure} (P) = \text{Height} (h) \times \text{Density} (\rho) \times \text{Gravity} (g) ]

When the height (h) is doubled, the resulting pressure immediately doubles, assuming the density (which remains constant for water under normal conditions) and the gravitational constant (g) are unchanged. This linear relationship between the height of the water column and the resultant pressure illustrates why the psi measurement increases proportionally with increased height.