# Physics Textbooks

Free and open physics textbooks.

## OpenStax

[OpenStax Physics](https://openstax.org/subjects/science) provides free, peer-reviewed textbooks:

- College Physics
- University Physics (3 volumes)
- Astronomy

## Order-of-Magnitude Physics

[Order-of-Magnitude Physics by Sanjoy Mahajan](https://www.inference.org.uk/sanjoy/oom/) teaches estimation and approximation techniques essential for physicists.