Wasn't the universe more disordered in the past?

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The discussion centers on the relationship between the universe's past temperature and its disorder, questioning how this aligns with the second law of thermodynamics. It highlights that while the universe was hotter and seemingly more chaotic in the past, entropy, which measures disorder, behaves differently over time. The conversation emphasizes that temperature and entropy are distinct concepts, with the universe's early state being more uniform rather than chaotic. Additionally, it asserts that the universe will not reach absolute zero, as this would contradict the Uncertainty Principle. Overall, the dialogue explores the complexities of entropy and temperature in the context of cosmic evolution.
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If the universe was hotter in the past, it was more chaotic and disordered with all the molecules and particles colliding with each other. How does this correspond to the second law of thermodynamics where things are supposed to get more chaotic as the time moves on, not backwards?
 
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T and S are different quantities. Can you calculate dS/dt and show it is negative?
 
Vanadium 50 said:
T and S are different quantities. Can you calculate dS/dt and show it is negative?

Yeah, mathematically what your saying makes sense. However, I don't understand it conceptually. Entropy is supposed to mean disorder and chaos. The future of the universe going to end with a whimper, not a bang. Its going to be anything but chaotic with the temperature becoming absolute zero.
 
You are confusing temperature with entropy.
 
First, the universe will never reach absolute zero, that violates the Uncertainty Principle. Second, at the early stages, the universe was far more uniform than it is today and will be in the future. At the beginning, it was so hot that even all of the forces were identical.
 

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