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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
A balloon filled with gas is made to just float on the surface of water. What will happen to it if it is submerged a certain distance below the surface and released?

The weight of the balloon is just balanced by upward thrust on the surface. When it is pushed inside, due to additional pressure of water column, the gas in the balloon gets compressed as a result of which the upward thrust decreases. Now the weight of the balloon is greater than the upward thrust and the balloon will sink as the equilibrium is disturbed.
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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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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 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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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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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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