This learning module, one in a series of 20 related training modules for apprentice stationary engineers, deals with steam. Addressed in the individual instructional packages included in the module are the following topics: steam formation and evaporation, types of steam, and steam transport and purification. Each instructional package in the module contains some or all of the following: a lesson goal, performance indicators, a study guide, a vocabulary list, an introduction, instructional text, an assignment, a job sheet, a self-assessment activity, a post-assessment instrument, answers to the post-assessment instrument, and a list of recommended supplementary references. (MN)