Simon Fraser University
Chem1 Virtual Textbook: Molecular Collision
The General Chemistry Virtual Textbook, or Chem 1, is broken into several sections covering various aspects of topics related to chemistry. This section seeks to answer the question, how far does a molecule travel between collisions?
Wikimedia
Wikipedia: Activation Energy
This site from the Wikipedia encyclopedia contains a qualitative explanation of activation energy, explaining what it is and why it is necessary. Links are also provided throughout the article for additional information.