13.3 Pressure in a Gas & Derivation of PV =1/3 Nm ⟨v²⟩ | Class 12th Physics Chapter 13 | New Book

📚 Welcome to Class 12 Physics (2nd Year) – New Book 2026 (PECTAA Punjab Board)! In this lecture, we study Chapter 13: Thermal Physics, Topic 13.3 – Pressure in a Gas and the Derivation of PV = ⅓Nm⟨v²⟩. This lecture is specially prepared for Class 12, 12th Class, 2nd Year, FSc, and ICS students according to the latest Punjab Board (PECTAA) 2026 syllabus. ✨ In this lecture, you will learn: 📖 What causes pressure in a gas ⚛️ Motion and collisions of gas molecules 🧮 Step-by-step derivation of PV = ⅓Nm⟨v²⟩ 📊 Meaning of ⟨v²⟩ (mean square speed) 💡 Easy conceptual explanation in simple language according to the latest textbook This lecture will strengthen your understanding of the Kinetic Theory of Gases and help you prepare for board exams, tests, MCQs, short questions, long questions, and derivations. Class 12 Physics Pressure in a Gas, Class 12 Physics Chapter 13 Pressure in a Gas, Class 12 Physics Thermal Physics, Class 12 Physics New Book 2026, 12th Class Physics Pressure in a Gas, 12th Class Physics Chapter 13, 2nd Year Physics Pressure in a Gas, 2nd Year Physics Chapter 13 Thermal Physics, FSc Physics Pressure in a Gas, ICS Physics Pressure in a Gas, Punjab Board Class 12 Physics, PECTAA Physics New Book 2026, Pressure in a Gas Class 12 Physics, Pressure in a Gas Explained, Pressure in a Gas Easy Explanation, Pressure in a Gas Full Lecture, Pressure in a Gas Urdu, Pressure in a Gas in Urdu, Pressure in a Gas Notes, Pressure in a Gas MCQs, Pressure in a Gas Short Questions, Pressure in a Gas Long Questions, Pressure in a Gas Numericals, Pressure in a Gas Board Preparation, Derivation of PV equals one by three Nm mean square velocity, PV equals one by three Nm mean square velocity derivation, PV equals one by three Nm v square derivation, Derivation of Pressure Equation of Gas, Gas Pressure Derivation Class 12, Mean Square Speed Class 12 Physics, Average of v square Class 12 Physics, Mean Square Velocity of Gas Molecules, Kinetic Theory of Gases Class 12, Kinetic Theory of Gases Chapter 13, Gas Molecules Motion, Molecular Motion in Gases, Elastic Collision of Molecules, Gas Pressure Formula, Physics Chapter 13 Thermal Physics, Physics Chapter 13 Urdu, Physics New Book 2026, Physics Punjab Board 2026, Intermediate Physics Chapter 13, Intermediate Physics Thermal Physics, Class 12 Physics Complete Course, 2nd Year Physics Complete Course, FSc Physics Complete Course, ICS Physics Complete Course, Physics in Urdu, Physics Lecture Class 12, Thermal Physics Lecture, Pressure in a Gas Lecture, Chapter 13 Physics Lecture, Physics Board Exam Preparation, Class 12 Physics Board Preparation, 2nd Year Physics Board Preparation, Punjab Board Physics Chapter 13, PECTAA Class 12 Physics, New Book 2026 Physics Chapter 13, Thermal Physics Concepts, Physics Concept Building, Gas Molecules Explanation, Molecular Speed of Gases, Random Motion of Gas Molecules, Pressure Due to Molecular Collisions, Gas Molecules and Pressure, Pressure of Ideal Gas, Ideal Gas Theory Class 12, Derivation Step by Step Physics, Easy Physics Lecture Class 12, Physics for FSC Students, Physics for ICS Students, Physics Pakistan, Class 12 Physics Pakistan, 12th Class Physics Pakistan, Physics Chapter 13 Complete Explanation, Thermal Physics Complete Lecture, Pressure in a Gas Complete Lecture, Physics Important Derivation, Physics Derivation in Urdu, Pressure Equation of Gas Derivation, Mean Square Speed Explained, Average Square Speed Explained, Gas Pressure Equation Class 12, Thermal Physics New Syllabus 2026, Physics Latest Book 2026, Class 12 Physics Urdu Medium, 2nd Year Physics Urdu Medium, Physics Video Lecture, Physics Online Class, Best Physics Lecture Class 12, Physics Chapter Wise Lecture, Physics Exam Preparation Pakistan 👍 Don't forget to Like, Share, and Subscribe for the complete Class 12 Physics (New Book 2026) lecture series.