Aeronautical Engineering Question:

Answer #1
when the external force is applied on the elastic body,the
body will deform from its original position.there will be an
internal resistance force which will act opposite to the
external force with the same magnitude.the internal
resistance force per unit area is called stress.....
pressure is the force which will act normal to the surface
and all over the surface..........

Answer #2
stress is defined as the force acting per unit area where as pressure is a point function it act normal the surface