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Gas: superheated steam
Vapor: saturated steam
The difference between liquid and vapor/gas is the compressibility.
A gas is a single thermodynamic phase, whereas a vapor is a mixture of two phases (generally gaseous and liquid phase). As an example, a cloud is made of water vapor; the clear sky contains gaseous water. Steam is vaporized water.
Offshore Pipelines in Gas and Sour Services should meet the requirements of the main body of the specification "Steel Line …
Some important sources for phase equilibrium data are:Dechema Chemistry Data Series: several volumes on VLE, LLE, gas solubility, heat of …