# What is the measure of randomness or disorder of particles making up a system called?

You speak of $\text{entropy..............}$
And $\text{entropy}$ may be defined as the statistical probability of disorder. It certainly can be measured, and it units are $J \cdot {K}^{-} 1 \cdot m o {l}^{-} 1$. Well established laws of thermodynamics insist that the entropy of the universe increases in every spontaneous process.