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The ratio of restoring force perpendicular to the surface to the area is known as stress.The ratio of external force perpendicular to the surface to the area is known as pressure
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1)Pressure represent intensity of external forces acting at a point but stress represent intensity of internal resisting forces develop at a point.
2)Pressure is always acts normal to the surface but stress may also act either normal or parallel to the surface.
3)Magnitude of pressure at a point in all directions remain same but magnitude of stress at a point in all the directions are unequal.
4)Pressure can be measured by using measuring device like pressure gauge but stress can't be measure directly by using any device.
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