Definition: A cup per second (cup/s) is a unit of volumetric flow rate that measures the volume of a substance passing through a surface per unit of time. It represents the amount of volume, measured in cups, that flows every second.

History/origin: The 'cup' is a unit of volume primarily used in cooking and is part of the United States customary system of measurement. The 'per second' component indicates a rate of change over time. The precise origin can be linked to the standardization of kitchen measurements.

Current use: Cups per second is rarely used in formal scientific or engineering contexts due to the relatively large and imprecise nature of the 'cup' unit. It might be encountered in high-volume dispensing or filling operations where speed is critical.