Pressure at any point of a fluid. :-
- is the pressure,
- is the normal force,
- is the area of the surface on contact.
Uniform Pressure :-
The pressure on a Plane area is uniform when the thrust on any portion of it is proportional to the area of that portion, and the pressure is measured by the thrust on a unit area.
Mean Pressure :-
The mean pressure on a plane area is the uniform pressure on it which will give the same resultant thrust as the actual one.
Pressure at a Point :-
The Pressure at any point of an area is the limit of the mean pressure on an indefinitely small area enclosing the point.