Mechanical Properties of Fluids

Physics Part II

Physics

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What height of water column produces the same pressure as 50 cm of Hg column?

The pressure due to height column, P = ρgh

If the pressure due to height column of different liquids is same, then the relation between the height coulumn is given by,

${\mathrm{\rho}}_{1}{\mathrm{gh}}_{1}={\mathrm{\rho}}_{2}{\mathrm{gh}}_{2}\phantom{\rule{0ex}{0ex}}\Rightarrow {\mathrm{h}}_{2}=\frac{{\mathrm{\rho}}_{1}}{{\mathrm{\rho}}_{2}}{\mathrm{h}}_{1}=\frac{13.6}{1}\times 50\phantom{\rule{0ex}{0ex}}=680\mathrm{cm}\phantom{\rule{0ex}{0ex}}=6.80\mathrm{m}$ ,

is the required height of the water column which will produce the same pressure as 50 cm of Hg column.

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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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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 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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