Imo State Polytechnic, Umuagwu, Imo State, 2019/2020 HND FORM AND PART-TIME FORM - Umuagwu
Thursday, 13 June 2019
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Umuagwu, Imo
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Imo State Polytechnic, Umuagwu, Imo State, 2019/2020 HND FORM AND PART-TIME FORM IS OUT CALL 08038403173 ND POST-UTME FORM is also on sale Call the Admin Office for Registration..
Pressure is a scalar quantity. It relates the vector surface element (a vector normal to the surface) with the normal force acting on it. The pressure is the scalar proportionality constant that relates the two normal vectors:
{\displaystyle d\mathbf {F} _{n}=-p\, d\mathbf {A} =-pmathbf {n} \, dA.} {\displaystyle d\mathbf {F} _{n}=-p\, d\mathbf {A} =-pmathbf {n} \, dA.}
The minus sign comes from the fact that the force is considered towards the surface element, while the normal vector points outward. The equation has meaning in that, for any surface S in contact with the fluid, the total force exerted by the fluid on that surface is the surface integral over S of the right-hand side of the above equation.
It is incorrect (although rather usual) to say "the pressure is directed in such or such direction".
Pressure is a scalar quantity. It relates the vector surface element (a vector normal to the surface) with the normal force acting on it. The pressure is the scalar proportionality constant that relates the two normal vectors:
{\displaystyle d\mathbf {F} _{n}=-p\, d\mathbf {A} =-pmathbf {n} \, dA.} {\displaystyle d\mathbf {F} _{n}=-p\, d\mathbf {A} =-pmathbf {n} \, dA.}
The minus sign comes from the fact that the force is considered towards the surface element, while the normal vector points outward. The equation has meaning in that, for any surface S in contact with the fluid, the total force exerted by the fluid on that surface is the surface integral over S of the right-hand side of the above equation.
It is incorrect (although rather usual) to say "the pressure is directed in such or such direction".
