What term describes the measurement of a fluid's resistance to flow?

The correct term that describes the measurement of a fluid's resistance to flow is viscosity. Viscosity quantifies how thick or sticky a fluid is, indicating its internal friction when layers of fluid move past each other. Fluids with high viscosity, like honey, flow slowly compared to low-viscosity fluids, like water, which flow easily. This property is crucial in a variety of applications, including engineering processes, where fluid flow affects system design, efficiency, and performance.

Density, while related to mass per unit volume, does not directly measure how a fluid resists flow. Pressure measures the force exerted by a fluid per unit area, and while related to flow, it is not a measure of resistance. Flow rate describes how much volume of fluid passes a point over time, but again, it does not indicate how that fluid resists flow. Hence, viscosity is the precise term for evaluating a fluid's resistance to flow.