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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
What do you mean by absolute pressure and gauge pressure?

Absolute pressure is the pressure above that of vacuum.

Absolute pressure = Gauge pressure + One atmospheric pressure.

Gauge pressure is the pressure above that of one atmospheric pressure. Since the pressure of vacuum is zero, it is referenced against an ambient air pressure.

Note: Atmospheric pressure is the pressure at any point equal to the weight of a column of air of unit cross-sectional area extending from that point to the top of the atmosphere.

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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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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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