Irreversible processes. Heat equation, diffusion equation

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SUMMARY

The discussion centers on the heat equation and diffusion equation, both of which illustrate irreversible processes due to their odd time derivatives. Participants question the apparent contradiction between these equations and the principle of reversibility in nature, emphasizing that while microscopically all processes exhibit time reversal symmetry, the equations suggest a loss of information. This highlights a fundamental tension in physics regarding the nature of irreversible processes and information conservation.

PREREQUISITES
  • Understanding of the heat equation and diffusion equation
  • Familiarity with concepts of time reversal symmetry in physics
  • Basic knowledge of irreversible processes in thermodynamics
  • Awareness of information conservation principles in physical systems
NEXT STEPS
  • Research the implications of time reversal symmetry in quantum mechanics
  • Explore the relationship between thermodynamics and statistical mechanics
  • Study the mathematical formulations of the heat and diffusion equations
  • Investigate the philosophical implications of irreversibility in physical processes
USEFUL FOR

Physicists, mathematicians, and students studying thermodynamics or statistical mechanics, as well as anyone interested in the philosophical implications of irreversible processes in nature.

Higgsono
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Both the heat equation and the diffusion equation describe processes which are irreversible, because the equations have an odd time derivative. But how can these equations describe the real world when we know that all processes in nature are reversible, information is always conserved? But these equations seems to describe processes in which information is not conserved.
 
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Who says all processes in nature are reversible?
 
Chestermiller said:
Who says all processes in nature are reversible?

Because microscopically all processes have a time reversal symmetry.
 

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