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Mechanical Properties of Solids

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Physics Part II

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Class 10 Class 12
An ideal gas of bulk modulus K is enclosed in a container of fixed walls. Find the stress set up in the gas when heated through temperature θ. Let γ be the temperature coefficient of cubical expansion of gas. 

Given, an ideal gas of bulk modulus 'K' and is heated to a temperature θ

Increase of temperature of gas at constant volume is equivalent if the gas is first heated at constant pressure and then compressed isothermally to original volume.

Let V be the volume of gas. When it is heated through a temperature θ at constant pressure, then the increase in volume of gas is,

∆V = Vγθ

Now compress the gas isothermally so that the volume decreases by ∆V = Vγθ.

If ∆P be the stress set up in the gas, then

K=stressstrain=ΔPΔV/V=ΔPγθ         ΔP = Kγθ 


What is the force of adhesion?

Adhesive force is the attractive force between two unlike molecules. They are caused by forces acting between two substances like electrostatic force (attraction due to opposing charges), mechanical force etc. 

E.g., Force of attraction between gum and paper.


What is the force of cohesion?

Cohesive attraction or cohesive force is the force of attraction between same types of molecules sticking together. 

Define interatomic forces and give an example?

The force between atoms of the molecule is called interatomic force.

E.g.The nucleus and electron cloud of a molecule is binded by electrostatic force. 

What is the nature of inter-atomic or inter-molecular forces?

Inter-atomic or inter-molecular forces are electrostatic in nature. 


What do you understand by intermolecular forces?

Intermolecular force is the force between the molecules of the substance is called intermolecular force.

There is a dipole-dipole interaction between the molecules.