The velocity of the Rolls-Royce RB.153 engine, or any other object, is defined as the rate of change of its position with respect to time. In aircraft design, this velocity is usually measured in meters per second (m/s) or feet per second (ft/s). The formula to calculate velocity (V) is:
- Velocity (V) represents the airspeed or velocity of the airflow entering the engine, typically measured in meters per second (m/s) or feet per second (ft/s).
- Mass Flow Rate (ṁ) is measured in kilograms per second (kg/s) or pounds per second (lb/s).
- Density (ρ) is the air density, usually measured in kilograms per cubic meter (kg/m³) or slugs per cubic foot (sl/ft³)
- Cross-Sectional Area (A) is the area through which the air is flowing, usually measured in square meters (m²) or square feet (ft²).