The above expression for vapor quality can be expressed as:

The percentage of liquid and vapor can be calculated using vapor quality.

Vapor quality refers to the vapor-liquid mixture that is contained underneath the dome.

In thermal engineering vapor quality is used for the mass fraction of vapor in the steam.

The evaporator now contains a mixture of water and steam of very low vapor quality (steam content).

The genesis of the idea of vapor quality was derived from the origins of thermodynamics, where an important application was the steam engine.

Vapor quality is an intensive property which can be used in conjunction with other independent intensive properties to specify the thermodynamic state of the working fluid of a thermodynamic system.

Demisters are often used where vapor quality is important in regard to entrained liquids particularly where separator equipment costs are high (e.g., high pressure systems) or where space or weight savings are advantageous.