**Z = PV**

**/**

**nRT**

(A). In case of Ideal gas, Z = 1 (PV=nRT)

(B). In case of real gas, Z ≠ 1 (PV ≠ nRT)

Thus for, real gas, Z ≠ 1, it can be greater than one or less than one.

(1). If Z>1, it refers PV is greater than nRT, which implies that gas is less compressible than expected from Ideal behaviour. Such a deviation from Ideal behaviour is known as

**.***Positive Deviation*(2). If Z<1, it refers PV is less than nRT, which implies that gas is more compressible than it should if it behaves Ideal gas. Such a deviation is known as

**.***Negative Deviation*
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