The velocity pressure is defined as the difference between which two pressures?

The velocity pressure is defined as the difference between which two pressures?

• A. Static Pressure and Atmospheric Pressure
• B. Zone
• C. Total Pressure and Static Pressure
• D. Velocity Pressure

Answer: (C)

The main idea is that velocity pressure is the dynamic part of the pressure created by air moving in a duct. It’s found by subtracting static pressure from total pressure, because total pressure equals static pressure plus this dynamic (velocity) component. In formulas, velocity pressure = total pressure − static pressure. This is why the difference between total and static pressures is the correct definition. The other options don’t fit because atmospheric pressure isn’t the flowing system’s pressure component related to motion, a “zone” isn’t a pressure, and velocity pressure isn’t simply the pressure itself—it's the specific difference that represents the dynamic contribution.

The main idea is that velocity pressure is the dynamic part of the pressure created by air moving in a duct. It’s found by subtracting static pressure from total pressure, because total pressure equals static pressure plus this dynamic (velocity) component. In formulas, velocity pressure = total pressure − static pressure. This is why the difference between total and static pressures is the correct definition.

The other options don’t fit because atmospheric pressure isn’t the flowing system’s pressure component related to motion, a “zone” isn’t a pressure, and velocity pressure isn’t simply the pressure itself—it's the specific difference that represents the dynamic contribution.