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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 large bubble is formed at one end of capillary tube and a small one at the other end. Which one will grow at the expense of the other?

Given, a large bubble on one end of the capillary tube and a small one on the other end of the capillary tube.

We have,

Excess of pressure inside the soap  bubble, $p=\frac{4T}{R}$.

This implies that pressure is inversely proportional to the radius of the bulb.

Therefore, pressure inside the bigger bubble will be less than that inside the smaller bubble. Therefore, the air will flow from smaller bubble to bigger bubble.

Hence the bigger bubble will grow at the expense of smaller bubble.

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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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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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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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