NCERT Book Class 11 Physics Part 2 Kinetic Theory

Chapter 12 Kinetic Theory
Download PDF

Read and download the Chapter 12 Kinetic Theory PDF from the official NCERT Book for Class 11 Physics. Updated for the 2026-27 academic session, you can access the complete Physics textbook in PDF format for free.

NCERT Class 11 Physics Chapter 12 Kinetic Theory Digital Edition

For Class 11 Physics, this chapter in NCERT Book Class 11 Physics Part 2 Kinetic Theory provides a detailed overview of important concepts. We highly recommend using this text alongside the NCERT Solutions for Class 11 Physics to learn the exercise questions provided at the end of the chapter.

Chapter 12 Kinetic Theory NCERT Book Class Class 11 PDF (2026-27)

13.1 INTRODUCTION
Boyle discovered the law named after him in 1661. Boyle, Newton and several others tried to explain the behaviour of gases by considering that gases are made up of tiny atomic particles. The actual atomic theory got established more than 150 years later. Kinetic theory explains the behaviour of gases based on the idea that the gas consists of rapidly moving atoms or molecules. This is possible as the inter-atomic forces, which are short range forces that are important for solids and liquids, can be neglected for gases. The kinetic theory was developed in the nineteenth century by Maxwell, Boltzmann and others. It has been remarkably successful. It gives a molecular interpretation of pressure and emperature of a gas, and is consistent with gas laws and Avogadro’s hypothesis. It correctly explains specific heat capacities of many gases. It also relates measurable properties of gases such as viscosity, conduction and diffusion with molecular parameters, yielding estimates of molecular sizes and masses.This chapter gives an introduction to kinetic theory.
 
13.2 MOLECULAR NATURE OF MATTER
Richard Feynman, one of the great physicists of 20th century considers the discovery that “Matter is made up of atoms” to be a very significant one. Humanity may suffer annihilation (due to nuclear catastrophe) or extinction (due to environmental disasters) if we do not act wisely. If that happens, and all of scientific knowledge were to be destroyed then Feynman would like the ‘Atomic Hypothesis’ to be communicated to the next generation of creatures in the universe. Atomic Hypothesis: All things are made of atoms - little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another.
Speculation that matter may not be continuous, existed in many places and cultures. Kanada in India and Democritus in Greece had suggested that matter may consist of indivisible constituents. The scientific ‘Atomic Theory’ is usually credited to John Dalton. He proposed the atomic theory to explain the laws of definite and multiple proportions obeyed by elements when they combine into compounds.
The first law says that any given compound has, a fixed proportion by mass of its constituents. The second law says that when two elements form more than one compound, for a fixed mass of one element, the masses of the other elements are in ratio of small integers.

 

Click on the below link to download NCERT Class 11 Physics Part 2 Kinetic Theory

Chapter 12 Kinetic Theory
NCERT Book Class 11 Physics Part 2 Kinetic Theory

Free study material for Chapter 12 Kinetic Theory

NCERT Book Class 11 Physics Chapter 12 Kinetic Theory

Download the official NCERT Textbook for Class 11 Physics Chapter 12 Kinetic Theory, updated for the latest academic session. These e-books are the main textbook used by major education boards across India. All teachers and subject experts recommend the Chapter 12 Kinetic Theory NCERT e-textbook because exam papers for Class 11 are strictly based on the syllabus specified in these books. You can download the complete chapter in PDF format from here.

Download Physics Class 11 NCERT eBooks in English

We have provided the complete collection of NCERT books in English Medium for all subjects in Class 11. These digital textbooks are very important for students who have English as their medium of studying. Each chapter, including Chapter 12 Kinetic Theory, contains detailed explanations and a detailed list of questions at the end of the chapter. Simply click the links above to get your free Physics textbook PDF and start studying today.

Benefits of using NCERT Class 11 Textbooks

The Class 11 Physics Chapter 12 Kinetic Theory book is designed to provide a strong conceptual understanding. Students should also access NCERT Solutions and revision notes on studiestoday.com to enhance their learning experience.

Where can I download the latest NCERT Book Class 11 Physics Part 2 Kinetic Theory in PDF for 2026-27?

You can download the latest, teacher-verified PDF for NCERT Book Class 11 Physics Part 2 Kinetic Theory for free on StudiesToday.com. These digital editions are updated as per 2026-27 session and are optimized for mobile reading.

Does this Physics book follow the latest NCERT rationalized syllabus?

Yes, our collection of Class 11 Physics NCERT books follow the 2026 rationalization guidelines. All deleted chapters have been removed and has latest content for you to study.

Why is it better to download NCERT Book Class 11 Physics Part 2 Kinetic Theory chapter-wise?

Downloading chapter-wise PDFs for Class 11 Physics allows for faster access, saves storage space, and makes it easier to focus in 2026 on specific topics during revision.

Are these NCERT books for Class 11 Physics sufficient for scoring 100%?

NCERT books are the main source for NCERT exams. By reading NCERT Book Class 11 Physics Part 2 Kinetic Theory line-by-line and practicing its questions, students build strong understanding to get full marks in Physics.