Mysteries in Classical Physics

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Discussion Overview

The discussion revolves around the existence of unresolved mysteries in Classical Physics, Thermodynamics, and Statistical Mechanics, contrasting these with the uncertainties present in Modern Physics. Participants explore whether classical principles are fully understood or if there remain significant unanswered questions.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants assert that while the principles of classical physics are established, there are still unresolved problems, particularly in statistical methods and phenomena like chaos theory and fluid turbulence.
  • Questions are raised about the unsolved aspects of fluid turbulence, specifically regarding the inability to derive the spectrum of average kinetic energy from first principles using the Navier-Stokes equation.
  • One participant suggests that the effectiveness of the Lagrangian formalism and the meaning of the Action may lead to philosophical inquiries, indicating deeper questions about the foundations of classical physics.
  • There is a call for definitions of 'mystery' and 'classical physics,' highlighting that interpretations may vary based on context.
  • The three-body problem is mentioned as a potential mystery within classical mechanics.
  • Another participant emphasizes the importance of clarifying what constitutes a 'mystery,' suggesting it involves discrepancies between theories or gaps in understanding mechanisms.

Areas of Agreement / Disagreement

Participants express differing views on whether classical physics is entirely resolved or if significant mysteries remain. Some argue that there are many unresolved issues, while others believe that classical principles are finalized.

Contextual Notes

Participants note that the definition of classical physics can vary, which may influence the discussion of what constitutes a mystery. There is also an acknowledgment that the relationship between classical and modern physics is complex, with some suggesting that classical physics is foundational to understanding modern theories.

Who May Find This Useful

This discussion may be of interest to those exploring the boundaries of classical physics, students of physics, and professionals in engineering who utilize classical principles in their work.

absurdist
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Are there any mysteries yet unexplained in Classical Physics, Thermodynamics or Statistical Mechanics? Or do all the mysteries in physics come out of Modern Physics?
 
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I think the principles of classical physics are finalized, so there are no mysteries as to principle, unlike, say, elementary particle physics where the principles are not yet completely established, which yields "mysteries". However, just because classical physics is "known" does not mean that every classical problem is easily solved, and so there are mysteries as to what classical physics has yet to predict. I would think this is mostly in statistical methods applied to classical physics. Chaos theory is one that comes to mind, like explaining the rings of Saturn. Severely non-equilibrium statistical mechanics of classical particles, maybe. Fluid turbulence is another.
 
What's unsolved about fluid turbulence?
 
If anything, I guess one could ask why our formalism works so well. Why does the Lagrangian formalism work so well and what is the meaning of the Action?

That probably crosses into philosophy, though, because even if you were to answer those questions, there would be another level that you could ask "why?" about.
 
absurdist said:
What's unsolved about fluid turbulence?

From a theoretical point of view, very first issue is: No one has been able to prove from first principles (Navier-Stokes equation) what will the spectrum of average kinetic energy (cf. Kolmogorov spectrum in turbulence).
 
Are there any mysteries yet unexplained in Classical Physics,

millions.

Please
Define 'mystery'...
Define 'classical physics':

What "classical physics" refers to depends on the context.

http://en.wikipedia.org/wiki/Classical_physics




Anyway, without quantum mechanics, we'd have no standard model of particle physics...and
would be hard pressed to understand light.
 
The three body problem?
 
Naty1 said:
millions.

Please
Define 'mystery'...
Define 'classical physics':



http://en.wikipedia.org/wiki/Classical_physics




Anyway, without quantum mechanics, we'd have no standard model of particle physics...and
would be hard pressed to understand light.

Sry for the late reply,
By mystery, I mean some kind of discrepancy between two widely accepted theories or some kind of lack of knowledge of the some mechanism?
By Classical Mechanics I mean Mechanics, Heat and Themodynamics and not QM, Nuclear phy and modern physics (string theory, etc)
Is there anything yet to be discovered in the kind of physics often used by engineers?
 

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