Home Fluid flow is never stationary, underlying that flow rate (Q) is never stationary and its time derivative (dot) is non-zero. Modern fluid mechanics can deal with this nature of fluid flow. To contribute to the society we are providing our capability to change the fundamental methodology in industrial structure. Qdot is devoted solely to flow metering based on the scientific definition. FlowBiz, the fluid science company, was founded in 1998, and has been providing a revolutionary flow measurement method and equipments using ultrasound – (UVP) – Ultrasonic Velocity Profiler – to the public ever since.