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Pressure represents intensity of external forces acting at a point. Stress represent intensity of internal resisting forces develop at a point
Pressure is always acts normal to the surface. Stress may also act either normal or parallel to the surface
Magnitude of pressure at a point in all direction remains same. Magnitude of stress at a point in all the direction are unequal
Pressure can be measure by using measuring device like pressure gauge. Stress can't be measure directly by using any device
Pressure is defined as force per unit area applied to an object in a direction perpendicular to the surface. And naturally pressure can cause stress inside an object. Whereas stress is the property of the body under load and is related to the internal forces. It is defined as a reaction produced by the molecules of the body under some action which may produce some deformation. The intensity of these additional forces produced per unit area is known as stress
