1. Pressure and temperature
  2. Reduced pressure and reduced temperature
  3. Critical pressure and critical temperature
  4. None of these
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1 Answers

Answer: Option 2

Since compressibility factor ($$Z$$) is an function of reduced temperature and reduced pressure i..e.., $$Z = fn\left( {{P_r},{T_r}} \right).$$     At same $${P_r}$$  and $${T_r}$$ the compressibility factor remains constant.

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