What is the PSI requirement to lift water one foot vertically?

The requirement to lift water one foot vertically is based on the principle of hydrostatic pressure. Specifically, water requires approximately 0.433 pounds per square inch (psi) of pressure to be lifted one foot. This value comes from the density of water and the effect of gravity on that density.

When considering the principle behind this, it's essential to understand that 1 psi is equivalent to 27.7 inches of water. Therefore, to determine how many psi are required for one foot of vertical lift, you convert inches into feet. Since there are 12 inches in a foot, the calculation confirms that just under half a psi is sufficient to lift water that distance, which rounds to approximately 0.434 psi.

Thus, the option indicating 0.434 psi accurately reflects the pressure required to lift water one vertical foot.