Fluid mechanics is the branch of physics that studies the behavior of fluids (liquids and gases) and the forces acting on them. It is fundamental in understanding phenomena in engineering, meteorology, oceanography, and biology, where fluid flow is crucial.
Duct sizing is crucial in HVAC system design as it directly affects airflow efficiency, energy consumption, and occupant comfort. Proper sizing requires considering factors such as air velocity, static pressure, and the acoustic impact of airflow, ensuring the system operates effectively and economically.