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Curated by: Khan Academy India - English (18 videos)
"Understand what mean free path is and how to derive its formula step by step. Learn how gas molecules collide, how the concept of a collision cylinder works, and how we arrive at the final expression "0:00 – Introduction to Mean Free Path 0:30 – Definition using collision distances ($\lambda$) 1:07 – Starting the derivation 2:35 – Collision cylinder concept explained 3:49 – Key terms: number density ($n$), velocity ($v$) 4:24 – Volume of collision cylinder 5:06 – Collisions per unit time 5:55 – Deriving mean free path using $v = \dfrac{\text{distance}}{\text{time}}$ 6:26 – Final formula: $\lambda = \dfrac{1}{\sqrt{2} , n \pi d^2}$ 6:59 – Recap and conclusion" Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Chandan Ganotra