Before discussing the difference between the centre of pressure and total pressure. Let us discuss something about hydrostatic pressure.
A surface exposed to a static fluid will be subjected to distribution of fluid pressure over the exposed area, the pressure distribution is called hydrostatic pressure distribution. The hydrostatic pressure distribution gives rise to a system of hydrostatic forces that act on the surfaces exposed area.
The determination of the hydrostatic forces along with their locations are important in the design of structures such storage tanks, reservoirs, dams etc…
What is the total pressure of fluids?
The total pressure is defined as the force exerted by a static fluid on a surface that is in contact with the fluid.The total pressure, the resultant hydrostatic force, always acts normal to the surface.
What is centre of pressure?
The point of application of the line of action of the resultant hydrostatic force and the corresponding surface is called centre of pressure. Center of pressure is also defined as the point of application of the total pressure on the corresponding surface.
In my words, assume that a body has acted upon by a number of forces. The centre of pressure or force acting on that body is such a direction that there will not be any unbalanced moment in that direction.
This is the difference between the total pressure and centre of pressure of fluids.Hope you can understand this topic. If you have any doubt please comment below.