What type of pressure is indicated when both tubes are connected to an inclined manometer?

When both tubes of an inclined manometer are connected, it measures the difference in pressure between the two points in a fluid system. This setup allows for a direct indication of velocity pressure. Velocity pressure is the difference between total pressure and static pressure and is related to the speed of fluid flow.

In the context of an inclined manometer, one tube typically connects to a point in the flow where a velocity head exists, while the other tube is open to the atmosphere or connected to a reference point. The reading on the manometer reflects the velocity pressure that results from the flow of the fluid. This pressure measurement is crucial for applications involving fluid dynamics, enabling the calculation of fluid velocity based on the pressure difference displayed on the manometer.

While static pressure refers to the pressure exerted by a fluid at rest, dynamic pressure pertains specifically to the fluid's motion and is captured by devices like manometers when they are configured to measure differences in pressure due to flow dynamics. Absolute pressure, on the other hand, measures total pressure relative to a perfect vacuum, which is not the focus of a manometer measuring velocity pressure. Thus, the most appropriate answer in this case is velocity pressure, as indicated by the operational principles of the inclined manometer.