Pressure at a point in a fluid

[abs123456]

Homework Statement

DEFINE PRESSURE AT A POINT IN A FLUID AND SHOW THAT IT IS A SCALOR QUANTITY?

Homework Equations

I saw this in a recent paper and i am not too sure about how i should go about doing it..
Its a 7 mark question..

Any Ideas?

The Attempt at a Solution

 

[Quinzio]

Bernoulli equation ?

 

[Stephen Tashi]

That must be nasty exam if they expect you to reconstruct the demonstration that is in the introductory section of the typical fluid mechanics book. It's something about analyzing the forces on the face of an infinitely small polyhedron of fluid.