Entropy Standard Molar Entropy Entropy is defined as the degree of freedom that particles of matter have.
Gases have a greater entropy than pure liquids which have a greater entropy than pure solids.
According to the Second Law of Thermodynamics, isolated systems tend to proceed toward higher entropy. Of course we know that there are lots of systems where the entropy state is actually lower some time in the future compared to an initial entropy. For example, if I left my desk alone as mountains of graded exams, homework, and other paperwork accumulated with time, and I made no effort to clean and organize my desk then the desk would become more cluttered as time progressed. The entropy state would soar. However, I do clean up and rearrange and organize items on my desk.