A manometer measures the pressure differential between two locations of a pipe carrying water. If the manometric liquid is mercury (specific gravity 13.6) and the manometer showed a level difference of 20cm, then the pressure head difference of water between the two tapings will be
- A. 1.26m
- B. 2.72m
- C. 1.36m
- D. 2.52m
Answer: D. 2.52m
Explanation: Head difference in terms of water $h_w = h_m (S_m/S_w - 1) = 0.20 (13.6/1 - 1) = 0.20 \times 12.6 = 2.52$ m.