Thermodynamics

Thermodynamics is the study of the transfer of heat energy. There are three main laws of thermodynamics, the second being frequently brought into arguments against evolution.

First
In any process, the total energy of the universe remains constant.

Second
There is no process that, operating in a cycle, produces no other effect than the subtraction of a positive amount of heat from a reservoir and the production of an equal amount of work.

Alternatively:

The entropy of an isolated macroscopic system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium.

Third
As temperature approaches absolute zero, the entropy of a system approaches a constant.

Alternative descriptions
The laws of thermodynamics have also been described in a tongue-in-cheek way as:
 * 1) You can't win.
 * 2) You can't break even.
 * 3) And you can't get out of the game.

Apologetics/Counter-apologetics
Creationists sometimes claim that evolution contradicts the second law of thermodynamics. This is usually due to a misunderstanding of what the second law actually says, or else due to the false assumption that the Earth is an isolated (closed) system.

There is also a rough thermodynamic argument against the existence of an orderly God that could create the universe.