what is low compressibility factor ?
Compressibilty factor (Z) is defined as the ratio of the molar volume of the gas to molar volume of the ideal gas at the constant temperature and pressure.
For Ideal gases Z=1 so, PV = nRT
For Real gases Z>1 So, PV > nRT (gas is less compressible than ideal gases)
or Z<1 So, PV<nRT (gas is more compressible than ideal gases)