2007-08-23 03:26:59 · 17 answers · asked by Harsh 2 in Science & Mathematics ➔ Physics
In the point of view of physics I mean!!!
2007-08-23 05:00:05 · update #1
Stress is a more general term than pressure. Pressure is just one kind of stress. It refers to the normal force on a surface (like when you put a weight on something). Shear stress is another kind of stress. It refers to the transverse force on a surface (like when you drag an object across the floor). They have the same units though - force per unit area; the force is just in a different direction.
The total stress on an medium is represented by a tensor, where pressure is represented by the diagonal elements, but that's getting bit technical.
2007-08-23 14:27:51 · answer #1 · answered by Dr. R 7 · 1⤊ 1⤋
Basically stress is the force that causes deformation, which we call strain. Pressure is that force spread out over an area. The simplest example I know of is the spring equation F = k dX. Here F, the force, is the stress and the strain is dX, the change in spring length. k is the spring coefficient. Point of clarification: Stress is a force, not a pressure, which is what Luis is defining. But Luis is correct in that by common practice people who work in mechanics do use, or should I say misuse, the term as force per exposed area. This is just yet another example of a field of knowledge misusing a term. [See source.] Another prime example is when people use the unit kilogram when speaking of weight. In day to day use, we hear something weighs such and such kilograms frequently. But, of course, we know that kilograms are units of mass that does not vary and not weight, which is a force that does vary. My point is this... physics and engineering are tough enough without all the inconsistencies in terminology. [See source.]
2016-05-20 23:11:54 · answer #2 · answered by ? 3 · 0⤊ 0⤋
Pressure is the application of force to a surface, and the concentration of that force in a given area.
Stress is a measure of force per unit area within a body.
You apply pressure to an object/surface and the result is a stress within the body.
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2007-08-28 17:14:29 · answer #3 · answered by Mukluk 2 · 1⤊ 1⤋
Pressure is the outside influence on something. It is the measure of force per unit area *applied* as seen on the object as a whole. Stress is the *internal reaction* (or internal pressure really). It has the same units, because it really is the same thing, but stress measures the internal distribution of force per unit area.
2007-08-23 03:35:32 · answer #4 · answered by Jon G 4 · 2⤊ 1⤋
Pressure is force per unit area APPLIED to a surface perpendicularly to that surface.
Stress on the other hand is a measure of of force per unit area within a body. Stress is the body's distribution of force per area that reacts to applied loads, like pressure.
Pressure is a scalar quantity, so its a number without a direction, like say mass, stress on the other hand is a vector or a tensor.
2007-08-23 04:34:28 · answer #5 · answered by Anonymous · 1⤊ 2⤋
Stress is the total thrust acting on a surface and the pressure is the thrust per unit area
2007-08-28 03:48:47 · answer #6 · answered by Joymash 6 · 0⤊ 1⤋
Stress is usually the result of pressure.
2007-08-23 03:31:43 · answer #7 · answered by Anonymous · 0⤊ 1⤋
Stress is caused by pressure
2007-08-23 03:30:05 · answer #8 · answered by Anonymous · 0⤊ 1⤋
Pressure is a measure of the force used on a body caused by exertion. Stress is the amount that body can withstand.
2007-08-23 04:47:34 · answer #9 · answered by Sidereal Hand 5 · 0⤊ 1⤋
Pressure is always applied and stress is the resultant within.
2007-08-23 03:30:36 · answer #10 · answered by babun 2 · 1⤊ 1⤋