Matter in the gaseous state (or phase). There are three normal states or phases of matter: solid, liquid, and gas. Pure homogenous substances change phases at relatively well defined and sharp points of transition.
The three phases of H2O are the best known example of the three states of matter. At sea level pressure, pure H2O has the following approximate phase change temperatures and specific names for those distinct phases:
SOLID PHASE - (ICE) - Below 320 F. H2O is a solid.
LIQUID PHASE - (WATER) - 320 to 2120 F. - H2O is a liquid.
GASEOUS PHASE (STEAM) - Above 2120 F. - H2O is a gas.
Related Subjects on this Website:
Glossary - Compressible and Non-Compressible Fluids
Glossary - Dissolved Substances and Gasses
Glossary - Newtonian and Non-Newtonian Fluids
Gauge Pressure - See Pressure
Grooved Pipe System - See Mechanical Pipe System
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