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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
Water spreads over a clean glass plate but mercury does not. Why?

Water spreads over a clean glass plate but mercury does not. In case of water, the surface tension force between glass plate and air is greater than the surface tension between liquid and solid. Therefore, angle of contact is less than 90o. Hemce, it will spread over the glass plate.

In case of mercury, the surface tension force between glass plate and mercury is less than the surface tension between liquid and solid. Therefore, angle of contact is greater than 90o. Hence, mercury will not spread over the glass plate.

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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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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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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 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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