When a dampener is closed, all pressure in the system changes to?

When a dampener is closed in a fluid system, the flow of the fluid is obstructed, which causes a change in the pressure dynamics of that system. With the dampener closed, the pressure builds up in the section of the system behind the damper. This pressure is characterized primarily as static pressure.

Static pressure is the pressure exerted by a fluid at rest or a fluid moving at a constant velocity. It does not involve any kinetic components that would be associated with moving fluid. When the dampener is closed, the kinetic energy associated with the movement of the fluid is effectively halted, and any pressure measured in that scenario reflects static pressure rather than dynamic pressure (velocity pressure).

The other options that include velocity components would not be correct because, with the dampener closed, no fluid is flowing past the point of measurement, negating any velocity pressure that would otherwise be present. Therefore, the correct understanding is that all pressure in the system transforms to static pressure when the dampener is fully closed.