🔍 Key Concepts

• U-tube manometer: pressure is indicated by the difference in height between the two water columns, not by the total height of one side. • For water, about 27.7 inches of water ≈ 1 psi, so 1 inch of water ≈ 0.036 psi. • You must read the actual inch difference shown on the scale in the illustration, then multiply by the inch‑to‑psi conversion to match the closest choice.

💭 Think About

• From the illustration, what is the vertical distance in inches between the two water surfaces in the U-tube? Don’t use the full scale, only the difference. • Once you have that height in inches of water, how do you convert inches of water to psi using the 27.7 in H₂O per 1 psi relationship? • After you convert, which multiple-choice option most nearly matches the psi value you calculated?

✅ Before You Answer

• Be sure you are using difference in water levels, not the height of only one leg. • Confirm you’re using the conversion for water (about 27.7 in H₂O = 1 psi), not mercury or another fluid. • After calculating psi, compare your result to the options and check which one is numerically closest without rounding errors.