The Feynman Lectures on Physics via

Caltech and The Feynman Lectures Website are pleased to present this online edition of The Feynman Lectures on Physics. Now, anyone with internet access and a web browser can enjoy reading a high quality up-to-date copy of Feynman’s legendary lectures.

However, we want to be clear that this edition is only free to read online, and this posting does not transfer any right to download all or any portion of The Feynman Lectures on Physics for any purpose.

This edition has been designed for ease of reading on devices of any size or shape; text, figures and equations can all be zoomed without degradation.1

Volume I

mainly mechanics, radiation and heat

Volume II

mainly electromagnetism and matter

Volume III

quantum mechanics

For comments or questions about this edition please contact Michael Gottlieb.

The Feynman Lectures on Physics

Richard Feynman talking with a teaching assistant after the lecture on The Dependence of Amplitudes on Time, Robert Leighton and Matthew Sands in background, April 29, 1963.

Photograph by Tom Harvey. Copyright © California Institute of Technology.

Contributions from many parties have enabled and benefitted the creation of the HTML edition of The Feynman Lectures on Physics. We wish to thank

  • Carver Mead, for his warm encouragement and generous financial support, without which this edition would have been impossible,
  • Thomas Kelleher and Basic Books, for their open-mindedness in allowing this edition to be published free of charge,
  • Adam Cochran, for tying up the many slippery loose ends that needed to come together in order for this edition to be realized,
  • Alan Rice for his steadfast enthusiasm for this project, and for rallying the support of Caltech’s Division of Physics Math and Astronomy ,
  • Michael Hartl and Evan Dorn, for their contributions to converting the FLP LaTeX manuscript into HTML.