Total Pressure is the sum of which two components?

Total Pressure is the sum of which two components?

• A. The sum of Velocity Pressure and Static Pressure
• B. The sum of Duct Area and Volumetric Flow Rate
• C. The sum of Capture Velocity and Face Velocity
• D. The product of Volume and Mass

Answer: (A)

Total pressure is the stagnation pressure of a moving fluid, which combines how much pressure is present from the fluid’s motion with how much pressure is in the fluid regardless of motion. In a duct or airflow, you have static pressure, the pressure that acts on surfaces when the air isn’t moving normal to them, and velocity (dynamic) pressure, which represents the air’s kinetic energy due to its speed. The total pressure is found by adding these two: static pressure plus velocity pressure (the dynamic part, roughly 0.5 rho v^2). That’s why the correct description is the sum of velocity pressure and static pressure. Other options mix in quantities that aren’t pressures (like duct area or volumetric flow rate) or refer to different velocity terms that don’t represent pressure components, or multiply volume and mass, which isn’t a pressure.

Total pressure is the stagnation pressure of a moving fluid, which combines how much pressure is present from the fluid’s motion with how much pressure is in the fluid regardless of motion. In a duct or airflow, you have static pressure, the pressure that acts on surfaces when the air isn’t moving normal to them, and velocity (dynamic) pressure, which represents the air’s kinetic energy due to its speed. The total pressure is found by adding these two: static pressure plus velocity pressure (the dynamic part, roughly 0.5 rho v^2). That’s why the correct description is the sum of velocity pressure and static pressure.

Other options mix in quantities that aren’t pressures (like duct area or volumetric flow rate) or refer to different velocity terms that don’t represent pressure components, or multiply volume and mass, which isn’t a pressure.