Does pressure have direction?Explain
Answers
Explanation:
Pressure: direction of action
Consider the line of action of the force due to pressure. On a molecular level, a flat solid surface is never flat. However, it is flat on average, so that, on average, for each molecule that rebounds with some component of momentum along the surface, another rebounds with the same component of the momentum in the opposite direction. The average momentum of the molecules in the direction along the surface will not change during their impact with the surface. We expect, therefore, that the average force due to pressure (on a macroscopic scale) acts in a direction which is purely normal to the surface. Furthermore, since the momentum of the molecules is randomly distributed in space, the magnitude of the force due to pressure should be independent of the direction of the surface on which it acts. For instance, a thin flat plate in air will experience a zero resultant force due to air pressure since the forces due to pressure on its two sides have the same magnitude (the pressure is independent of the orientation of the surface on which it acts) and they point in opposite directions (each force acts normal to its own surface). We say that pressure is isotropic (based on Greek words, meaning equal in all directions, or more accurately in the present case, independent of direction).
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Answer:
therefore , pressure is a scalar quantity, not a vector quantity. It had a magnitude but no direction associated with it.