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Mechanical Properties of Fluids

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Physics Part II

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
To empty an oil tin, two holes are made diagonally. Why?



When hole A is made in the tin, the oil coming out will be less because the volume of the air above the oil increases and hence the pressure of the air decreases, obstructing the flow. When the pressure of air above oil plus pressure due to height column of oil becomes less than atmospheric pressure, the oil stops to ooze out. 

If another hole B is made which is diagonal to the first hole, atmospheric air from this hole keeps on entering and hence pressure at A remains greater than atmospheric pressure and hence oil will continue to flow out from the tin.
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What is hydrostatics?

Hydrostatics is the branch of fluid mechanics that studies incompressible fluids at rest. The study of fluids at rest or objects placed at rest in fluids is hydrostatics.
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What is hydrodynamics?

Hydrodynamics is the branch of science that studies about the force exerted by the fluids or acting on the fluids. 
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Why solids have definite shape while liquids do not have definite shape?

Solids: Intermolecular forces are very strong and thermal agitations are not sufficiently strong to separate the molecules from their mean position. Solids are rigid and hence they have definite shapes.
Liquids: In liquids intermolecular forces are not sufficiently strong to hold the molecules at definite sites, as a result they move freely within the bulk of liquid, therefore, do not possess definite shapes. Liquids take the same shape as that of the container. 
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Do intermolecular or inter-atomic forces follow inverse square law?

No. Intermolecular and inter-atomic forces do not obey the inverse square law. 
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What is fluid?

Any material that can flow is a fluid. Liquids and gases are examples of fluid.


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