Home Vapor Posted June 24, 2007 Vapor Share URL Copied to Clipboard https://ingaa.org/glossary/vapor/ « Back to Glossary Index The gaseous state of a substance. Related Articles: Glossary: Pressure, AtmosphericGlossary: ShrinkageGlossary: Treating PlantGlossary: British Thermal Unit (Btu), DryGlossary: British Thermal Unit (Btu), Saturated« Back to Glossary Index Related Fact Sheets Safety Pivoting to Support a Net-Zero Future – IMCI Program February 21, 2023