Which term refers to the speed at which a fluid moves?

• A. Velocity
• B. Elevation
• C. Volume
• D. Pressure

Answer: (A)

The main idea here is understanding how we describe how fast a fluid is moving. In fluid mechanics, velocity is the measure of the speed and direction of fluid particles. When we refer to the speed at which a fluid moves, velocity is the term that fits because it conveys how fast the fluid travels and in what direction. A handy relation is Q = v × A, showing that the volumetric flow rate equals velocity times cross-sectional area; this ties speed to how much water passes a point per unit time. Elevation describes vertical position, not motion. Volume means the amount of fluid, not its movement. Pressure is the force per area within the fluid and relates to energy and driving forces, not the actual speed of movement.