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The simple animation below shows an aircraft flying through an atmosphere of constant density. As the molecules of the air impact on the nose of the aircraft the kinetic energy is converted into pressure energy. This pressure energy is known as dynamic pressure.
Dynamic pressure is dependant on two variables:
| 1.The density of the air. |  |
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| 2.The speed of the aircraft relative to the speed of the air. |  |
We will now examine these two variables a little bit further:
1. The density of the air - If the density of the air increases, the dynamic pressure increases. We have already seen that the density of the air decreases with an increase in altitude. We can therefore state that, if the speed of the aircraft relative to the speed of the air remains constant, an increase in altitude will result in a decrease in dynamic pressure.
2. The speed of the aircraft relative to the speed of the air - The important thing to note here is that it is the RELATIVE speed that is important. For example an aircraft flying at 100 knots through still air will have the same relative speed as a stationary aircraft in a 100 knot wind.
The two variables are combined in the equation for dynamic pressure:
We will examine this equation a little further on the next page:
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| The International Standard Atmosphere | Air Data Parameters | Dynamic Pressure 2 | |||