Caltech’s Division of Physics, Mathematics and Astronomy and The Feynman Lectures Website are pleased to present this online edition of

Feynman • Leighton • Sands


Restore my view 1

Now, anyone with internet access and a web browser can enjoy reading2 a high quality up-to-date copy of Feynman’s legendary lectures.

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.3

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.






This video visually demonstrates some basic quantum physics concepts using the simple case of a free particle. All the simulations here are based on real equations and laws.
See more information here:…
The mathematics involved was taken from this excellent book:…