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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
Discuss how we measure the volume of an irregular body using Archimedes’ principle.

According to Archimedes principle, in order to measure the volume of a body, weigh it in air and in liquid.

Let,
W
1 and W2 be the weight of body in air and liquid,
V be the volume of body, and
ρ be the density of liquid.

Now, as per Archimedes’s principle, decrease in weight of body in liquid is equal to the weight of liquid displaced by body.

That 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.
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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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What is fluid?

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

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