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Physics, Astronomy & Cosmology / If the Universe is expanding, what's happening to entropy?
« on: 21/04/2017 10:47:18 »
I have got really confused by the definition of the laws of thermodynamics and how they are represented.
0. Heat flows from a difference in temp.
1. Energy cannot be created or destroyed
2. Entropy always goes up
3. at t=0 entropy equals 0
This basically says to me...
1. higher t = higher entropy
2. t is always going up
3. So everything that ever happens is irreversible and will eventually turn the universe into a giant oven.
BUT..
The universe is expanding, meaning volume change, meaning temperature drop, so entropy is decreasing.. OR is the rate of the universe expanding maintaining a constant level of entropy in the system?
I don't get it. someone must be wrong and although it is probably me, I cant spot the logic holes.
0. Heat flows from a difference in temp.
1. Energy cannot be created or destroyed
2. Entropy always goes up
3. at t=0 entropy equals 0
This basically says to me...
1. higher t = higher entropy
2. t is always going up
3. So everything that ever happens is irreversible and will eventually turn the universe into a giant oven.
BUT..
The universe is expanding, meaning volume change, meaning temperature drop, so entropy is decreasing.. OR is the rate of the universe expanding maintaining a constant level of entropy in the system?
I don't get it. someone must be wrong and although it is probably me, I cant spot the logic holes.