Nootan Solutions Behaviour of Perfect gas and Kinetic Theory of Gases ISC Physics Class-11 Ch-22 Vol-2 Nageen Prakashan.  Step by step Solutions of Numericals of latest edition of Kumar and Mittal ISC Physics Part-2 Class-11 Nageen Prakashan Questions. Visit official Website CISCE for detail information about ISC Board Class-11 Physics.

## Nootan Solutions Behaviour of Perfect gas and Kinetic Theory of Gases ISC Physics Class-11 Ch-22

 Class: 11 Subject: Physics Part-2 Chapter : 22 Behaviour of Perfect gas and Kinetic Theory of Gases
 Board ISC Writer / Publications Nootan / Nageen Prakashan / Kumar and Mittal Topics Solved Numericals of page 841,842

### Nootan Solutions Behaviour of Perfect gas and Kinetic Theory of Gases ISC Physics Class-11 Ch-22 Vol-2 Kumar and Mittal

#### What are the Assumptions of Kinetic Theory of Gases :-

• All gas molecules constantly move in random directions.
• The size of molecules is very less than the separation between the molecules
• The molecules of the sample do not exert any force on the walls of the container during the collision when the gas sample is contained.
• It has a very small time interval of collision between two molecules, and between a molecule and the wall.
• Collisions between molecules and wall and even between molecules are elastic in nature.
• Newton’s laws of motion can be seen in all the molecules in a certain gas sample.
• With due course of time, a gas sample comes to a steady state. The molecule’s distribution and the density of molecules do not depend on the position, distance and time.

#### Kinetic Theory of Gases :-

The gases are made up of a large number of molecules and they are flying in a random direction with a certain speed. By knowing their speed or position, one can figure out the macroscopic properties. In other words, by knowing the value of velocity or internal energy of gas molecules, one should be able to figure out the temperature or pressure.

## What is Kinetic Theory of Gases :-

The behaviour of gas molecules is explained with the help of the kinetic theory of gases. It is the study of gas molecules at the macroscopic level. Following are the five postulated of the kinetic theory of gases:

1. Gas is a composition of a large number of molecules that are constantly in a random movement.
2. The volume of the molecules is negligible as the distance between the gas molecules is greater than the size of the molecules.
3. The intermolecular interactions are also negligible.
4. The collision of molecules with each other and with the walls of the container is always elastic.
5. The average kinetic energy of all the molecules is dependent on the temperature.

### What is the significance of the Kinetic theory of gases :-

By knowing the Temperature we can directly figure out the average Kinetic energy of a gas molecule. No matter what gas are you considering. Unless and until it is an ideal gas.

Knowing the macroscopic parameters of gases like Pressure, Volume, Temperature etc., one can accurately calculate the microscopic parameters like Momentum, Velocity, Internal energy, Kinetic energy, Thermal energy etc.

### Nootan Solutions Behaviour of Perfect gas and Kinetic Theory of Gases ISC Physics Class-11 Ch-22 Vol-2 Kumar and Mittal

(Page-841,842)

1. Based on gas law and gas equation :-

2. Based on kinetic theory of gases :-

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