Pound per hour (lb/h) is a unit of mass‑flow rate that quantifies how many pounds of material pass a given point each hour, and it is commonly symbolized as lb/h or lb · h⁻¹. This measurement is essential for tracking the speed of liquids, gases, or solids in industrial processes such as fuel delivery, chemical production, and HVAC systems, as well as in scientific applications like laboratory dosing and environmental monitoring. By expressing flow in pounds per hour, engineers and technicians can easily calculate consumption, size equipment, and compare performance across different systems, making lb/h a practical and widely adopted standard for both everyday operational control and precise scientific analysis.