Texas Education Agency
Texas Gateway: 1.1 Physics: An Introduction
By the end of this section, you will be able to do the following: Explain the difference between a principle and a law and Explain the difference between a model and a theory.
Simon Fraser University
Chem1 Virtual Textbook: The Limits of Classical Physics
Acting as a subtopic of the General Chemistry Virtual Textbook's section on Atoms and the Periodic Table, this site discusses the limits associated with classical physics. Topics covered include light and heat with additional information...