explain how the expression PV/RT can be used to show gases behave non ideally at high pressure

At high pressure the two basic assumptions ​behind the ideal gas law—namely, that gas molecules have negligible volume and that intermolecular interactions are negligible—are no longer valid.
For a mole of ideal gas (n = 1) the quantity PV/RT equals 1 at all pressures. When PV/RT is plotted as a function of P for 1 mol of several different gases. then we can see that at high pressures the deviation from ideal behavior (PV/RT = 1) is large and is different for each gas. This shows that real gases do not behave ideally at high pressure. 

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