The process of fluid components exchange between phases to reach chemical equilibrium so that total mass of individual components spread between phases according to ambient pressure
p and temperature
T.
The quantitative measure of exchange is given by cross-phase exchange coefficients.
The most popular cross-phase exchange coefficients are Solution GOR R_s and Vaporized Oil Ratio R_v
See Also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Fluid (PVT) Analysis
Cross-phase fluid exchange @model