1. What is Velocity Pressure (Dynamic Pressure)?

Definition: Velocity pressure is the pressure generated by the kinetic energy of moving air or fluid, calculated as half the product of density and velocity squared.

Purpose: It's essential in aerodynamics, HVAC design, wind engineering, and fluid dynamics to understand the force exerted by moving air.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( q \) — Velocity pressure (Pascals)
• \( \rho \) — Air density (kg/m³)
• \( V \) — Velocity (m/s)

Explanation: The kinetic energy per unit volume of moving air is calculated by multiplying half the air density by the square of the velocity.

3. Importance of Velocity Pressure Calculation

Details: Accurate velocity pressure calculation is crucial for designing ventilation systems, calculating wind loads on structures, and aerodynamic analysis.

4. Using the Calculator

Tips: Enter the air density (default 1.225 kg/m³ for standard air) and velocity in m/s. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the standard air density value?
A: At 15°C and sea level, air density is approximately 1.225 kg/m³. This decreases with altitude and increases with lower temperatures.

Q2: How does velocity affect the pressure?
A: Pressure increases with the square of velocity - doubling velocity quadruples the dynamic pressure.

Q3: When would I need to adjust air density?
A: For high-altitude applications, high-temperature environments, or when working with gases other than air.

Q4: What units are used in this calculation?
A: The calculation uses SI units: kg/m³ for density, m/s for velocity, resulting in Pascals (Pa) for pressure.

Q5: How is this different from static pressure?
A: Static pressure is the pressure in a fluid at rest, while dynamic pressure is due to motion. Total pressure is their sum.