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When a substance exists as part liquid and
part vapor at saturation conditions, its quality (x)
is defined as the
ratio of the mass of the vapor to the total mass of both
vapor and liquid. Thus,if
the mass of vapor is 0.2 lbm and the mass of the liquid is
0.8 lbm, the quality is 0.2 or 20%.Quality
is an intensive property. Quality has meaning when the
substance is in a saturated state only,
at saturation pressure and temperature. The area under the
bell-shaped curve on figure 6shows
the region in which quality is important.
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