ï»¿ We have two barometers. One barometer contains mercury and second water. Which one will register more pressure? (Neglect the surface tension effect). from Physics Mechanical Properties of Fluids Class 11 Manipur Board

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We have two barometers. One barometer contains mercury and second water. Which one will register more pressure? (Neglect the surface tension effect).

Mercury barometer will register more pressure than water barometer. This is because of the following reasons:

i) Mercury is around 14 times heavier than water i.e., it is denser than water.

ii) The vapour pressure of mercury is low as compared to that of water. So, mercury will be more sensitive to changes in the atmospheric pressure and rises more quickly to record the changes in the atmospheric pressure.
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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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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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