Glossary of Thermodynamic Terms

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quality A measure of the relative amounts of vapor and liquid exist in a two-phase system.  The quality is defined as the ratio of the mass of vapor to the total mass of the system.  Saturated vapor has a quality of one because all of the mass is in the vapor phase. Saturated liquid has a quality of zero because none of the mass in in the vapor phase.  [dimensionless] 2B3  ,  4
quasi-equilibrium A process in which the system remains in equilibrium at all times.  This type of process is also known as a quasi-static process,  1D6, 4A14 - 17, 4E3