What term refers to the resistance caused by the imperfections in the shape of a vent tube?

The term that refers to the resistance caused by the imperfections in the shape of a vent tube is dynamic pressure. Dynamic pressure is associated with the velocity of the air moving through the vent tube and how that velocity imparts pressure as a result of the flow’s turbulence and changes in direction due to the imperfections. While static head refers to the pressure exerted by a column of air due to gravity, it does not account for the effects of airflow speed and turbulence within the system. Similarly, velocity head describes the energy of the moving air but does not specifically pertain to the resistance created by the vent's shape. Air resistance, while related, is a more general term and does not directly reflect the specific effects observed in a vent tube due to its imperfections. Understanding dynamic pressure helps in analyzing how airflow can be impacted by the physical characteristics of the ventilation system.