ï»¿ Large force is required to draw apart two glass plates enclosing a thin layer of water film. Explain why. from Physics Mechanical Properties of Fluids Class 11 Manipur Board

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Large force is required to draw apart two glass plates enclosing a thin layer of water film. Explain why.

A thin film is formed between the glass plates. And this thin film has a concave surface all around as shown in the figure below:

The pressure on convex side is less than that on concave side because of surface tension.

i.e.,                         pi< p0

Therefore, there is net inward force on the plates due to difference of pressure and require some force to separate them.

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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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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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