Which term represents the kinetic energy in moving air?

Which term represents the kinetic energy in moving air?

• A. Velocity Pressure
• B. Static Pressure
• C. Total Pressure
• D. Duct Area

Answer: (A)

Velocity pressure represents the kinetic energy in moving air. When air flows, its bulk motion carries energy proportional to density times velocity squared, and this energy per unit volume is the dynamic (or velocity) pressure, defined as 1/2 ρ v^2. In HVAC contexts, static pressure accounts for energy in stationary air, while total pressure is the sum of static and dynamic pressures. Duct area is just a size/shape property and does not quantify energy. So the moving-air kinetic energy is captured by velocity pressure.

Velocity pressure represents the kinetic energy in moving air. When air flows, its bulk motion carries energy proportional to density times velocity squared, and this energy per unit volume is the dynamic (or velocity) pressure, defined as 1/2 ρ v^2. In HVAC contexts, static pressure accounts for energy in stationary air, while total pressure is the sum of static and dynamic pressures. Duct area is just a size/shape property and does not quantify energy. So the moving-air kinetic energy is captured by velocity pressure.