Steam 2 topics · 2 sources ScienceEnergyWater in vapor form; used as the working fluid in steam turbines and heating systems.US DOE Office of Energy Efficiency & Renewable Energy — Glossary of Energy-Related Terms retrieved 2014-05-26 Cite ScienceWaterWater vapor that rises from boiling water.Bureau of Reclamation — Bureau of Reclamation Glossary Cite