ï»¿ Define the terms thrust and pressure. Give the SI unit of pressure. Name three applications of the knowledge of pressure. from Physics Mechanical Properties of Fluids Class 11 Manipur Board

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Define the terms thrust and pressure. Give the SI unit of pressure. Name three applications of the knowledge of pressure.

Thrust: The force exerted by liquid normal to any surface in contact with it, is called thrust.

Pressure: The thrust exerted by a liquid per unit area of surface in contact with liquid is called pressure.

The SI unit of pressure is N/m2 or Pascal (Pa).

Application of pressure:

i) Hydraulic machines
ii) Blood pressure - Pressure exerted by the circulating blood upon the walls of the blood vessels.
iii) Variation of pressure with depth - submarines are designed to withstand such enormous pressure.

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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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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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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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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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