Fluid Presure
Páginas: 7 (1584 palabras)
Publicado: 2 de octubre de 2012
Atlantic Bilingual School
Atlantic Bilingual School
Anthony Clarke
Mrs. Doris
Fluid Pressure
Physics
10 “A”
04/06/2012
Pressure
Formula
Mathematically:
Formula
Mathematically:
Pressure is the effect of a force applied to a surface. Pressure is the amount of force acting per unit area. The symbol of pressure is p.
Pressure is a scalar quantity. It relates thevector 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:
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 normalvectors:
The minus sign comes from the fact that the force is considered towards the surface element, while the normal vector points outward.
It is incorrect (although rather usual) to say "the pressure is directed in such or such direction". The pressure, as a scalar, has no direction. It is the force given by the previous relationship to the quantity that has a direction, not the pressure. Ifwe change the orientation of the surface element, the direction of the normal force changes accordingly, but the pressure remains the same.
Pressure applied to a fluid in a closed container is transmitted equally to every point of the fluid and to the walls of the container.
Pressure applied to a fluid in a closed container is transmitted equally to every point of the fluid and to the walls ofthe container.
Pressure is transmitted to solid boundaries or across arbitrary sections of fluid normal to these boundaries or sections at every point. It is a fundamental parameter in thermodynamics, and it is conjugate to volume.
Note that the variation with height does not depend on any additional pressures. Therefore Pascal's law can be interpreted as saying that any change in pressureapplied at any given point of the fluid is transmitted undiminished throughout the fluid.
Fluid Pressure
Fluid pressure is the pressure at some point within a fluid, such as water or air.
Fluid pressure occurs in one of two situations:
* An open condition, called "open channel flow":
* The ocean
* Swimming pool
* The atmosphere
* A closed condition, called closedconduits:
* Water line
* Gas line
Pressure in open conditions usually can be approximated as the pressure in "static" or non-moving conditions (even in the ocean where there are waves and currents), because the motions create only negligible changes in the pressure. Such conditions conform with principles of fluid statics. The pressure at any given point of a non-moving (static)fluid is called the hydrostatic pressure.
Closed bodies of fluid are either "static", when the fluid is not moving, or "dynamic", when the fluid can move as in either a pipe or by compressing an air gap in a closed container. The pressure in closed conditions conforms with the principles of fluid dynamics.
The concepts of fluid pressure are predominantly attributed to the discoveries of BlaisePascal and Daniel Bernoulli. Bernoulli's equation can be used in almost any situation to determine the pressure at any point in a fluid. The equation makes some assumptions about the fluid, such as the fluid being ideal and incompressible. An ideal fluid is a fluid in which there is no friction, it is in viscid, zero viscosity. The equation is written between any two points in a system that containthe same fluid.
In an ideal gas, molecules have no volume and do not interact. Pressure varies linearly with temperature, volume, and quantity according to the ideal gas law,
In an ideal gas, molecules have no volume and do not interact. Pressure varies linearly with temperature, volume, and quantity according to the ideal gas law,
Fluids in Motion
Idea: Since the motion of fluids...
Atlantic Bilingual School
Anthony Clarke
Mrs. Doris
Fluid Pressure
Physics
10 “A”
04/06/2012
Pressure
Formula
Mathematically:
Formula
Mathematically:
Pressure is the effect of a force applied to a surface. Pressure is the amount of force acting per unit area. The symbol of pressure is p.
Pressure is a scalar quantity. It relates thevector 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:
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 normalvectors:
The minus sign comes from the fact that the force is considered towards the surface element, while the normal vector points outward.
It is incorrect (although rather usual) to say "the pressure is directed in such or such direction". The pressure, as a scalar, has no direction. It is the force given by the previous relationship to the quantity that has a direction, not the pressure. Ifwe change the orientation of the surface element, the direction of the normal force changes accordingly, but the pressure remains the same.
Pressure applied to a fluid in a closed container is transmitted equally to every point of the fluid and to the walls of the container.
Pressure applied to a fluid in a closed container is transmitted equally to every point of the fluid and to the walls ofthe container.
Pressure is transmitted to solid boundaries or across arbitrary sections of fluid normal to these boundaries or sections at every point. It is a fundamental parameter in thermodynamics, and it is conjugate to volume.
Note that the variation with height does not depend on any additional pressures. Therefore Pascal's law can be interpreted as saying that any change in pressureapplied at any given point of the fluid is transmitted undiminished throughout the fluid.
Fluid Pressure
Fluid pressure is the pressure at some point within a fluid, such as water or air.
Fluid pressure occurs in one of two situations:
* An open condition, called "open channel flow":
* The ocean
* Swimming pool
* The atmosphere
* A closed condition, called closedconduits:
* Water line
* Gas line
Pressure in open conditions usually can be approximated as the pressure in "static" or non-moving conditions (even in the ocean where there are waves and currents), because the motions create only negligible changes in the pressure. Such conditions conform with principles of fluid statics. The pressure at any given point of a non-moving (static)fluid is called the hydrostatic pressure.
Closed bodies of fluid are either "static", when the fluid is not moving, or "dynamic", when the fluid can move as in either a pipe or by compressing an air gap in a closed container. The pressure in closed conditions conforms with the principles of fluid dynamics.
The concepts of fluid pressure are predominantly attributed to the discoveries of BlaisePascal and Daniel Bernoulli. Bernoulli's equation can be used in almost any situation to determine the pressure at any point in a fluid. The equation makes some assumptions about the fluid, such as the fluid being ideal and incompressible. An ideal fluid is a fluid in which there is no friction, it is in viscid, zero viscosity. The equation is written between any two points in a system that containthe same fluid.
In an ideal gas, molecules have no volume and do not interact. Pressure varies linearly with temperature, volume, and quantity according to the ideal gas law,
In an ideal gas, molecules have no volume and do not interact. Pressure varies linearly with temperature, volume, and quantity according to the ideal gas law,
Fluids in Motion
Idea: Since the motion of fluids...
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