Fluid Pressure
It is a branch of Mathematics/Science which deals with the conditions of equilibrium of masses of fluids or of solids in contact with fluids at rest.
Fluid: A fluid is a substance which require some support to maintain its shape. Also fluids are substances which flow or are capable of flowing. Thus, a fluid is a collection of material particles so situated in contact with each other as to form a continuous mass, and such that the application of the slightest possible force to any one of them is sufficient to displace it from it from its position relative to the rest. That part of Statics, where a fluid appears as the principal means of transmission of force, is termed Hydrostatics. Fluids are of two kinds: Liquids and Gases.
Liquid: A liquid is a fluid which is more or less incompressible and it requires some external support to maintain its shape. Its volume is the same whatever be the shape of the vessel containing it. For example, water is a liquid, because whenever it be poured from one vessel into another of different shape, its volume does not change but it takes the form of the new vessel.
Gas: A gas is a fluid which is compressible and a given portion of it can be made to expand indefinitely by increasing sufficiently the shape to which it has access. Neither volume nor the shape of a given portion of a gas is fixed.
Centre of Pressure
If a plane area be immersed in a liquid. Pressure at any point is normal to the plane surface and it is proportional to the depth of the element below the free surface of the liquid. The totality of all these pressures on one side of the plane area will constitute a system of like parallel forces. The magnitude of the resultant of these like parallel forces is called the “resultant fluid thrust”. Its magnitude is the arithmetic sum of all the parallel forces. That point where the resultant of like parallel forces is called the “centre of pressure”.
Definition: The centre of pressure (C.P) of a plane area immersed in a fluid is that point of the plane area at which the resultant thrust of the fluid on one side of the plane area acts.
Note: The depth of the centre of pressure of a plane area immersed in a fluid is greater than the depth of the centre of gravity.
It is a branch of Mathematics/Science which deals with the conditions of equilibrium of masses of fluids or of solids in contact with fluids at rest.
Fluid: A fluid is a substance which require some support to maintain its shape. Also fluids are substances which flow or are capable of flowing. Thus, a fluid is a collection of material particles so situated in contact with each other as to form a continuous mass, and such that the application of the slightest possible force to any one of them is sufficient to displace it from it from its position relative to the rest. That part of Statics, where a fluid appears as the principal means of transmission of force, is termed Hydrostatics. Fluids are of two kinds: Liquids and Gases.
Liquid: A liquid is a fluid which is more or less incompressible and it requires some external support to maintain its shape. Its volume is the same whatever be the shape of the vessel containing it. For example, water is a liquid, because whenever it be poured from one vessel into another of different shape, its volume does not change but it takes the form of the new vessel.
Gas: A gas is a fluid which is compressible and a given portion of it can be made to expand indefinitely by increasing sufficiently the shape to which it has access. Neither volume nor the shape of a given portion of a gas is fixed.
Centre of Pressure
If a plane area be immersed in a liquid. Pressure at any point is normal to the plane surface and it is proportional to the depth of the element below the free surface of the liquid. The totality of all these pressures on one side of the plane area will constitute a system of like parallel forces. The magnitude of the resultant of these like parallel forces is called the “resultant fluid thrust”. Its magnitude is the arithmetic sum of all the parallel forces. That point where the resultant of like parallel forces is called the “centre of pressure”.
Definition: The centre of pressure (C.P) of a plane area immersed in a fluid is that point of the plane area at which the resultant thrust of the fluid on one side of the plane area acts.
Note: The depth of the centre of pressure of a plane area immersed in a fluid is greater than the depth of the centre of gravity.
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