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Mechanical Properties of Fluids

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Physics Part II

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Class 10 Class 12
Due to atmospheric pressure, the air exerts a force of 1.5x105N. This force is equivalent to if we place 15000kg weight on our body. Why we do not get squeeze or get crushed under such a high force?

Given that, 
Air exerts a force of 1.5 × 105 N 

We do not get squeezed or crushed under such a high force because our body is able to bear such a heavy weight as body contains tiny pores. The air exerts pressure from inside. Also, there is blood pressure which is exerted from inside. 

Both these pressure combine and balance the atmospheric pressure which is exerted, enabling us to tolerate such a huge pressure without getting crushed. 

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. 

What is fluid?

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


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.

Do intermolecular or inter-atomic forces follow inverse square law?

No. Intermolecular and inter-atomic forces do not obey the inverse square law. 

What is hydrodynamics?

Hydrodynamics is the branch of science that studies about the force exerted by the fluids or acting on the fluids.