Important Notice: Limited Web Access Dec 16 to 18, 2016

AIChE will undertake a routine upgrade of our digital infrastructure over the weekend of December 16-18, 2016. During this period access to certain areas of the website will be limited. Learn more about how access will be affected.


  1. The energy produced by running or falling water that is used for driving machinery, especially for generating electricity;
  2. A source of such energy, as a waterfall.
  3. A water right owned by a mill.

Go to Process Safety Glossary

Download the app: iTunes | Google