Entropy Change in Time of Universe

In summary, the conversation discusses the concept of an "entropy of the overall universe" and whether it can be considered a constant quantity. The conclusion is that it is problematic to define such an entropy and the time derivative is not constant.
  • #1
Arman777
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Is there something like ##\frac {dS\dt}=...## Like in the general system,

I know its always positive but I want to know is there any constant quantity of the universe like universe entropy increases amount of 45J/C or something like that.Or it depends only the knows closed systems which we ca find numerical values.
Thanks
 
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  • #2
No.
It is problematic to define an "entropy of the overall universe", but no matter what you do, the time derivative is not constant.
 
  • #3
mfb said:
No.
It is problematic to define an "entropy of the overall universe", but no matter what you do, the time derivative is not constant.
Yeah you are right it cannot be constant.I see well thanks then
 

1. What is entropy?

Entropy is a measure of the disorder or randomness in a system. It is a thermodynamic property that describes the amount of energy that is not available to do work.

2. How does entropy change over time in the universe?

According to the second law of thermodynamics, the total entropy of a closed system (such as the universe) always increases over time. This means that the universe is becoming more disordered and less organized.

3. What is the relationship between entropy and the arrow of time?

The arrow of time refers to the direction in which time flows - from the past to the future. The increase in entropy over time is a key factor in determining the direction of time's flow. This is because as entropy increases, systems become more disordered and it is highly unlikely for them to spontaneously become more ordered. Therefore, the arrow of time is closely related to the increase in entropy.

4. Can entropy decrease in a localized system?

Yes, entropy can decrease in a localized system. However, this decrease in entropy must be offset by an increase in entropy in another part of the system. Overall, the total entropy of the closed system will still increase over time.

5. How does the concept of entropy relate to the heat death of the universe?

The heat death of the universe is a hypothetical scenario in which the universe reaches a state of maximum entropy, resulting in the end of all thermodynamic processes. This is because as entropy increases, energy becomes more evenly distributed and no work can be extracted from it. Therefore, the concept of entropy is closely linked to the heat death of the universe.

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