# Oxygen is expensive in fermenters * Oxygen wants to be a gas so you can’t just dissolve it in a liquid <!-- #evidence/changable --> [Web URL for this note](http://notes.benjaminreinhardt.com/Oxygen+is+expensive+in+fermenters) [Comment on this note](http://via.hypothes.is/http://notes.benjaminreinhardt.com/Oxygen+is+expensive+in+fermenters)