A pressure of 75 psi is equivalent to how many feet of water head?

To convert pressure in psi to feet of water head, you use the conversion factor that 1 psi is approximately equal to 2.31 feet of water. This conversion is derived from the relationship between pressure, density, and gravitational force. Specifically, the formula used is:

Feet of water head = psi x 2.31

In this case, using a pressure of 75 psi:

75 psi x 2.31 feet/psi = 173.25 feet

This shows that the pressure of 75 psi corresponds to 173.25 feet of water head, making this the correct answer for the problem. Understanding this conversion is vital for applications in plumbing and backflow prevention, as it helps you interpret pressure readings in terms of water column height, which is more intuitive in many practical situations.