significance of compressibility factor?
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The compressibility factor (Z), also known as the compression
factor, is a useful thermodynamic property for modifying the ideal
gas law to account for the real gas behavior.[1] In general, deviation
from ideal behavior becomes more significant the closer a gas is to a
phase change, the lower the temperature or the larger the pressure.
Compressibility factor values are usually obtained by calculation from
equations of state (EOS), such as the virial equation which take
compound specific empirical constants as input. For a gas that is a
mixture of two or more pure gases (air or natural gas, for example), a
gas composition is required before compressibility can be calculated.
Alternatively, the compressibility factor for specific gases can be read
from generalized compressibility charts[1] that plot Z as a function of
pressure at constant temperature
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