What is the difference between an ordinary stretched elastic membrane and that of the free surface of liquid? from Physics Mechanical Properties of Fluids Class 11 Manipur Board
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Mechanical Properties of Fluids

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Physics Part II

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What is the difference between an ordinary stretched elastic membrane and that of the free surface of liquid?

Ordinary stretched elastic membrane obeys Hooke’s law i.e., tension increases with stretching while tension in the liquid does not increase on increasing the area. When the elastic membrane is stretched, the separation between the molecules increases.

In case of liquid when surface area is increased the molecules move from bulk to surface film and the distance between the molecules remains constant. 
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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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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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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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