Which measure expresses pressure as the height of a fluid column?

Which measure expresses pressure as the height of a fluid column?

• A. Feet of head
• B. PSI
• C. Bar
• D. Pascal

Answer: (A)

Pressure expressed as the height of a fluid column is described as feet of head. This idea comes from the hydrostatic relationship P = ρgh, which means a given pressure corresponds to a certain height h of fluid (h = P/(ρg)). In practical terms, feet of head tells you how tall a column of fluid would need to be to produce that pressure, a concept often used in hydraulics, pumps, and water systems. The other units—PSI (pounds per square inch), Bar, and Pascal—are direct measures of pressure (force per area) rather than a height of fluid. They quantify how strong the pressure is, rather than how tall a fluid column would have to be to create it.

Pressure expressed as the height of a fluid column is described as feet of head. This idea comes from the hydrostatic relationship P = ρgh, which means a given pressure corresponds to a certain height h of fluid (h = P/(ρg)). In practical terms, feet of head tells you how tall a column of fluid would need to be to produce that pressure, a concept often used in hydraulics, pumps, and water systems.

The other units—PSI (pounds per square inch), Bar, and Pascal—are direct measures of pressure (force per area) rather than a height of fluid. They quantify how strong the pressure is, rather than how tall a fluid column would have to be to create it.