What type of pressure is defined as the pressure at a given point in a conduit or appliance with a specific volume of water flowing?

The definition provided refers to pressure at a certain point in a system where a specific volume of water is flowing, which aligns with the concept of "Residual Pressure." Residual pressure represents the pressure available in the system when the water is flowing and is affected by the demand from the sprinkler system or any other outlets. When water flows, the velocity of the water increases, leading to a drop in static pressure, but residual pressure captures the dynamic state of the system during flow conditions.

In contrast, static pressure is measured when the water is not flowing, and thus does not apply to the scenario involving specific flow conditions. Normal pressure is not a technical term used in the context of hydrodynamics and sprinkler systems, and velocity pressure is more about the kinetic energy of flowing water rather than pressure at a designated point in a fully functioning system.

The correct response provides a clear understanding of how pressure behaves in a flowing system, especially in sprinkler systems where understanding flow conditions is essential for proper design and operation.