In industrial, agricultural, commercial, and academic environments, flow and velocity are common terms used to describe the output of
solids, liquids, or gases from equipment, infrastructure, structures, or vehicles.
Airflow and air velocity are common measurements made by HVAC test and balance contractors, health and safety specialists, facilities managers, and
ventilation system installers to assess the performance of an airflow system, including balance, efficiency, and cost-effectiveness. While the
terms flow and velocity relate to one another, the misunderstanding surrounding these terms often leads to their incorrect use.