Second Law of Thermodynamics

The first law of thermodynamics states that throughout any process, energy is conserved. 

But, just because a process might not violate the first law of Thermodynamics, doesn't mean the process will happen. 

The second law of thermodynamics is 'how well' a process occurs.  

For example, a turning paddle in a reservoir of water will do work on the water, with some energy lost to the surroundings. But, supplying heat to a paddle in water will not do work to the water.

Click on a subpage below to find out where the second law of thermodynamics arises!