Why do rockets have center of gravity and center of pressure?

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Why on a rocket is there a center of gravity and a separate center of pressure?

The center of pressure is the average location of where the pressure force is applied. Think of it like the center of gravity, the location where the average weight of an object is, except this time it is the location of average pressure. The center of pressure is where the forces of lift and drag are exerted. It is important for engineers to know the center of pressure since it allows them to evenly balance the lift on aircraft.


If there is no gravity, how can a rocket have a center of gravity that is different than center of pressure?