Compressibility factor for almost all the gases are approximately same at the same

Compressibility factor for almost all the gases are approximately same at the same Correct Answer Reduced pressure and reduced temperature

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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