What is the difference between static and dynamic pressure?

Static pressure refers to the pressure exerted by a fluid at rest, meaning it is the force per unit area that is applied uniformly in all directions. This pressure represents the energy stored in a fluid due to its position and is crucial in understanding the behavior of fluids in various scenarios, such as in airfoil design or when considering the pressure exerted on the walls of a container.

Dynamic pressure, on the other hand, relates to the kinetic energy of a moving fluid. It is defined as the difference between the total pressure and the static pressure and is indicative of the fluid's velocity. This is particularly relevant in aerodynamics, where understanding the balance of forces due to static and dynamic pressure helps explain lift, drag, and other flight characteristics.

As such, the correct choice reflects the fundamental nature of static pressure, highlighting that it is specifically related to fluids at rest, while dynamic pressure pertains to moving fluids. The other options do not accurately describe the characteristics of these pressures or mix up their definitions.