## Chapter Chosen

Mechanical Properties of Fluids

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A U-shaped wire is dipped in a soap solution, and removed. The thin soap film formed between the wire and a light slider supports a weight of 1.5x10–2N (which includes the small weight of the slider). The length of the slider is 30 cm. What is the surface tension of the film?

Given, the thin soap film formed between the wire and slider has two free surfaces.

Weight supported by the light slider = 1.5 $×$ 10-2 N

Length of the slider, L = 30 cm

So, total length of free surface that touches with slider is 2L = 60cm = 0.60 m.

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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 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 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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