Hi. Thermodynamics is the study of energetic processes in physical and chemical processes.

First Law. Energy can be transfered and transformed, but cant be created nor destroyed. The energy of the Universe is constant and conserved.

Second Law. In every natural process, thermal energy (heat) is produced. Heat is the most random and disordered form of energy, the random kinetic movement of particles. Therefore, with this heat production, the entropy (S) (disorder) of the Universe is constantly increasing.

Third Law. An ideal (perfect) crystal solid at 0 degrees Kelvin has 0 entropy. Must be Kelvin, because it is an absolute 0. In Kelvin there is no such thing as temperatures below 0.

Entropy (S) is randomness and disorder. The concept entropy was introduced and described by Clausius.

Now, my question. I have heard of something very strange, a concept difficult to grasp and assimilate: negative entropy. In mathematics, negative numbers make plenty of sense to me: a negative number is a loss, deficiency or debt. However, I find it difficult to see physical meaning in negative entropy. An ideal crystal solid at 0 degrees Kelvin cant possibly be any more ordered, so how can there be negative entropy ? Please explain to me the negative entropy concept. It will be appreciated. Thanx.