What is reflux?

Reflux can also refer to the process in the body where fluids back up and travel in the wrong direction, especially acid reflux, where stomach fluid bubbles back up into the esophagus and burns the lining.

Reflux is a technique involving the condensation of vapors and the return of this condensate to the system from which it originated. It is used in industrial and laboratory distillations. It is also used in chemistry to supply energy to reactions over a long period of time.