Convert 65 feet of head to inches of Mercury.

To convert feet of head to inches of mercury, you need to understand the relationship between these two units. One foot of water head is equivalent to approximately 0.865 inches of mercury.

To perform the conversion for 65 feet of head, the calculation is as follows:

1. Start by converting feet to inches:

( 65 \text{ feet} \times 12 \text{ inches/foot} = 780 \text{ inches of water} ).

2. Next, convert inches of water to inches of mercury using the conversion factor:

( 780 \text{ inches} \times 0.0361 \text{ inches of Hg/inches of water} \approx 28.14 \text{ inches of Hg} ).

Thus, when you apply the conversion factors correctly, the resultant value corresponds to approximately 28.14 inches of mercury, which aligns with one of the potential answers. Therefore, 65 feet of head indeed converts to approximately 28.14 inches of mercury.