Mechanical Properties of Fluids

Physics Part II

Physics

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What happens if the capillary tube is of insufficient height?

The ascent formula is given by,

$\mathrm{h}=\frac{2\mathrm{T}}{\mathrm{Rpg}}\phantom{\rule{0ex}{0ex}}\Rightarrow \mathrm{Rh}=\frac{2\mathrm{T}}{\mathrm{\rho g}}=\mathrm{constant}$

where,

R is the radius of meniscus, and

h is the height to which the liquid rises.

If tube is of insufficient height, the liquid will rise to the top of the tube and spread over the brim. Thus, the radius of meniscus will adjust to a new value so that Rh remains constant.

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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 fluid?

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

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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 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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