636 Period 3 Motor Final Practice Test

Pressure from a liquid column scales with height and density. For water, the specific weight is 62.4 lb/ft^3, so the pressure increase with depth is P = gamma × h. With h = 1 foot, P = 62.4 lb/ft^2. Convert to psi by dividing by 144 (in^2 per ft^2): 62.4 / 144 ≈ 0.433 psi. Since psig is gauge pressure, this is the pressure above atmospheric pressure. So one vertical foot of water produces about 0.433 psig. The other values would correspond to different heights.