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The term saturation defines a
condition in which
mixture of vapor and liquid can exist together at
a given temperature and pressure. The temperature
at which vaporization (boiling) starts to
occur for a given pressure is called the saturation
temperature or boiling point. The pressure
at which vaporization (boiling) starts to occur
for a given temperature is called the saturation
pressure.
For water at 212°F, the saturation
pressure is 14.7 psia and, for water at14.7
psia, the saturation temperature is 212°F.For
a pure substance there is a definite relationship
between saturation pressure and saturation
temperature. The higher the pressure,the
higher the saturation temperature. The graphical
representation of this relationship between
temperature and pressure at saturated conditions
is called the vapor pressure curve. Atypical
vapor pressure curve is shown in Figure 5. The
vapor/liquid mixture is at saturation when the
conditions of pressure and temperature fall on the curve.
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