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Entropy is a measure of disorder or information content in a system, first postulated by [[Lazare Carnot]] in 1803.  

Entropy is a measure of disorder or information content in a system, first postulated by [[Lazare Carnot]] in 1803.  

The second law of thermodynamics states that entropy will always increase over time within a [[closed system]], defining a closed system as one in which neither matter nor energy may enter or leave.

The second law of thermodynamics states that entropy will never decrease over time within a [[closed system]], defining a closed system as one in which neither matter nor energy may enter or leave.

Entropy is undeniable and yet creates perhaps insurmountable difficulties for many modern theories of physics.  For example, it renders time asymmetric, resulting in an [[arrow of time]] that is difficult to reconcile with the [[theory of relativity]].  Entropy casts doubt on whether physical laws or the speed of light are invariant and perpetual.   

Entropy is undeniable and yet creates perhaps insurmountable difficulties for many modern theories of physics.  For example, it renders time asymmetric, resulting in an [[arrow of time]] that is difficult to reconcile with the [[theory of relativity]].  Entropy casts doubt on whether physical laws or the speed of light are invariant and perpetual.