The Difference Between

What is the difference between pressure and stress?


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2013-05-18 06:40:48
2013-05-18 06:40:48

Pressure is the external force acting over a unit surface area of a material. Stress is an internal force acting over a cross sectional area within the material. It may also be thought of as the internal resistive response of a material to the applied external pressure. They both have the units of force / area.

think it as-

suppose we have a cubical solid mass. we apply external force of few magnitude on it and this force will try to deform the cube. at the same instant an internal force will generate within the cube that will try to maintain the shape and size of the cube i.e. this internal force will work against the applied external force. this induced force within the cube is stress.

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The Law of Stress states that Stress is the difference between Pressure and Adaptability of any kind. The law is expressed as a formula, S = P - A, or Stress = Pressure - Adaptability. This universal law is valid for physical, biological, and psychological stress. The Law of Stress concept was developed in 1978 by Dr. Robert Dato, an American Psychoanalyst.

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I'm assuming you mean the difference between true stress and engineering stress: Engineering stress is only accounting for the area given at the time before deformation. True stress accounts for the change in area that occurs as the material is stressed. If you stay in the elastic region, there will be almost no difference between the two.

pressure is always act normal to the plane but stress may or may not be normal to the may act tangential or at certain angle to the plane. pressure is always act normal to the plane but stress may or may not be normal to the may act tangential or at certain angle to the plane.

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stress is a force per unit area.

If there are several different sources of stress, the most important or largest source of stress might be identified as the principle stress.

A pressure gauge indicates actual pressure and a differential pressure gauge indicates the difference in pressure.

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There is a huge difference between tension and pressure in physics. Tension refers to a pulling force and pressure refers to a pushing force.

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Differential air pressure is a term of comparison. It may be stated as "the difference in air pressure between..." and finished from there. Let's look at a sentence and then break it down. "The differential air pressure across the body of the 747 is a cause of concern over the life of the aircraft." A jet at altitude has a pressurized cabin. The outside air pressure is very low. (Think Mount Everest. Almost no one climbs it without suplimental oxygen.) There is a difference between the air pressure inside the cabin and the air pressure outside the cabin. This is an instance of differential air pressure. The differential air pressure puts stress on the body of the plane. When the aircraft is back on the ground, the differential pressure disappears. The alternating application and neutralization of stress across the hull damages the structure over the life of the airframe. The differential pressure is the difference between the pressure of the air in the (pressurized) cabin at altitude and the pressure of outside air at that altitude.

The difference between H and L in are is high pressure and low pressure. Air moves with high pressure air falling and low pressure air rising.

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