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Mechanical Properties of Fluids

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

A soap bubble of radius 10mm is blown from soap solution of surface tension 0.06 N/m. Find the work done in blowing the bubble. What addition work will be done in further blowing to double the radius?

The soap bubble is formed from the soap solution.

Therefore, increase in the surface area of soap bubble is equal to total surface area of soap bubble.

Since the soap bubble has two free surfaces, therefore increase in area of free surface of bubble is,

We have,

Radius of the soap bubble, r = 1mm=10-3

Now the work done in blowing the bubble

Additional work done in doubling the radius of bubble is,

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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.
977 Views

What is hydrodynamics?

Hydrodynamics is the branch of science that studies about the force exerted by the fluids or acting on the fluids.
799 Views

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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Do intermolecular or inter-atomic forces follow inverse square law?

No. Intermolecular and inter-atomic forces do not obey the inverse square law.
1257 Views

What is fluid?

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

976 Views