How many inches of mercury is equivalent to 13.55 inches of water?

To determine how many inches of mercury are equivalent to 13.55 inches of water, it’s essential to know the relationship between the two measurements. The conversion factor that relates inches of water to inches of mercury (Hg) is that 1 inch of mercury is equal to approximately 28.96 inches of water.

Using this conversion factor, you can calculate the equivalent inches of mercury by dividing the number of inches of water by the conversion factor.

So, for 13.55 inches of water, you would perform the following calculation:

13.55 inches of water ÷ 28.96 inches of water per inch of mercury ≈ 0.467 inches of mercury.

Thus, rounding this value does not yield 1 inch of mercury. The correct conversion would provide a result closer to 0.5 inches of mercury.

Therefore, the approach taken in option A does not reflect the accurate conversion and highlights the misunderstanding of the measurement relationships in fluid dynamics concerning water and mercury. Recognizing these relationships is crucial for a fire service pump operator when dealing with pressure readings and fluid levels in various scenarios.