Friday, October 29, 2010

The 3 Laws of Thermodynamics

Law 1: (also called Law of Conservation of Matter) states that matter or energy cannot be created or destroyed. In a reaction, the amount of matter in the reactants equal the amount of matter in the products. Same with energy. The amount of energy required for the reaction, is the same as the amount of energy exposed after the reaction (ex. in the form of heat)
Since some energy goes into the outside world, this energy contributes to the second law.

Law 2: (also called Law of Increased Entropy) states that as energy is lost, it increases randomness and chaos in an environment.

Law 3: states that as temperatures approach absolute zero, matter will no longer move; thus no more energy. At this point there will no longer be any matter. Since there is no movement, electrons ceases to make bonds, molecules fall apart, and everything disappears.

Law of Entropy (2nd Law):
- the 'loss' of energy into the outside world creates more chaos. This can suggest that the universe is losing energy, not gaining it. However this 'lost' energy contributes to more randomness in the world.
- example, the universe is constantly expanding (getting more random/chaotic). Whatever happens in the universe will lead to more randomness/chaos.
this law talks about how in nature things are irreversable. An example being evolution; organisms become more and more complicated, the organism does not go back to being simpler.
-For some situations it appears that things are getting simpler (ex. water freezing into ice), but since energy is required to freeze the ice, the situation is acutally more complicated.

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