If there is no fluid flow in the system, what can be said about total pressure (TP) and static pressure (SP)?

When there is no fluid flow in a system, the relationship between total pressure (TP) and static pressure (SP) simplifies significantly. Total pressure is defined as the sum of static pressure and dynamic pressure. Dynamic pressure relates to the motion of the fluid; therefore, when the fluid is at rest, the dynamic pressure is zero.

In this scenario, since there is no motion in the fluid, the entirety of the total pressure is attributed to static pressure. As a result, TP is equal to SP. This condition reflects the balance of pressures in a fluid at rest, demonstrating that all the pressure present is due to the static component alone.

This concept is fundamental in fluid mechanics and applies in scenarios ranging from engineering systems to natural phenomena, helping to understand how fluids behave under different conditions.