Entropy vs Life: Does Nature Use Life to Increase Entropy?

  • Context: Graduate 
  • Thread starter Thread starter aurorasky
  • Start date Start date
  • Tags Tags
    Entropy Life
Click For Summary

Discussion Overview

The discussion centers on the relationship between life and the second law of thermodynamics, particularly how living systems interact with entropy. Participants explore whether life contributes to an overall increase in entropy and the implications of this relationship in theoretical and conceptual terms.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions how life processes align with the second law of thermodynamics, suggesting that while living systems may decrease their own entropy, the total entropy of the universe must still increase.
  • Another participant argues that entropy increases regardless of the presence of life, emphasizing that much of the universe's entropy is found in dead stars, implying that life does not significantly contribute to entropy increase.
  • A later reply seeks clarification on the role of temperature differences in entropy changes, suggesting that these differences may have a more substantial impact on entropy than life itself, and questions whether life is merely a statistical byproduct of certain conditions.
  • Further inquiries are made regarding specific thermodynamic concepts, such as thermalization and the derivation of certain thermodynamic equations, indicating a desire for deeper understanding of the underlying principles.

Areas of Agreement / Disagreement

Participants express differing views on the role of life in relation to entropy, with some suggesting that life contributes to entropy increase and others asserting that entropy would increase independently of life. The discussion remains unresolved with multiple competing perspectives.

Contextual Notes

Participants reference specific thermodynamic arguments and concepts, indicating that there may be limitations in understanding or assumptions about the definitions of entropy and thermalization that are not fully explored.

Who May Find This Useful

This discussion may be of interest to those studying thermodynamics, the philosophy of life and entropy, or anyone curious about the interplay between biological processes and physical laws.

aurorasky
Messages
7
Reaction score
0
How do life and all processes linked to life go along with the second law of thermodynamics? If living creatures decrease their entropy because they are open systems and in a state of non-equilibrium with the environment, in general does the total entropy increase? (for example, if we have two exactly equal planets, does life evolution bring about a greater increase in entropy?) Is it correct then to conclude that, in some ways, nature uses life to achieve a higher state of entropy?
 
Science news on Phys.org
I would not conclude that. Entropy increases with our without life. By consuming the plants formed on planets life is not making a very significant contribution. Most of the entropy in our universe is in dead stars.
 
@ZapperZ: thank you for the very informative articles (I really enjoyed reading them). Could you perhaps clarify some points?

1. If I am getting it right, entropy decreases because of day/night temperature differences and this decrease is much greater than the decrease in entropy due to life evolution, by several orders of magnitude. However, the decrease due to the sun is not related to life at all: it would be present even in Dead-Earth. But this decrease in entropy is what can possibly drive evolution and indeed for this reason the overall rate of entropy increase is positive. So my claim was wrong: if life didn't exist, entropy would be higher (I believed that, organizing themselves, living beings brought about greater increase of entropy in the environment. Maybe life is a statistical byproduct, whenever the conditions are permissive?). Did I understand Bunn's argument correctly?

2. Could you explain these passages:

'In this estimate we did not include any entropy increase due to thermalization of the radiant energy emitted by the Earth. If we assume that this radiation eventually thermalizes with the cosmic background (CMB) radiation in deep space, then an additional, much larger entropy increase results' What is thermalization?

'With these assumptions, we can use the standard thermodynamic result mu/T=- partial S/partial N' I don't know how he came up with this.
 

Similar threads

  • · Replies 13 ·
Replies
13
Views
4K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
1
Views
3K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 12 ·
Replies
12
Views
3K
  • · Replies 39 ·
2
Replies
39
Views
7K
  • · Replies 29 ·
Replies
29
Views
5K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K