In a pump system, head measures the energy per unit weight of fluid (pressure). Which option best describes this concept?

In a pump system, head measures the energy per unit weight of fluid (pressure). Which option best describes this concept?

• A. The rate of flow
• B. The energy per unit weight of the fluid (pressure)
• C. The density of the fluid
• D. The temperature of the fluid

Answer: (B)

Head is a measure of the energy in the fluid per unit weight. Think of it as how high a column of fluid would rise if that energy were converted into height. This is why head is expressed in units of length and is tied to energy through the relation E per weight ≈ height. In hydraulic terms, total head combines pressure energy, elevation energy, and velocity energy (p/(ρg) + z + v^2/(2g)). In a pump system we’re concerned with the energy the fluid must have to move through the system, not the rate of flow, density, or temperature. So describing head as the energy per unit weight best captures the concept.

Head is a measure of the energy in the fluid per unit weight. Think of it as how high a column of fluid would rise if that energy were converted into height. This is why head is expressed in units of length and is tied to energy through the relation E per weight ≈ height. In hydraulic terms, total head combines pressure energy, elevation energy, and velocity energy (p/(ρg) + z + v^2/(2g)). In a pump system we’re concerned with the energy the fluid must have to move through the system, not the rate of flow, density, or temperature. So describing head as the energy per unit weight best captures the concept.