Second law of thermo on a macroscopic scale

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The second law of thermodynamics effectively predicts macroscopic phenomena, despite its underlying mechanisms being rooted in microscopic physics. Initially developed for macroscopic systems, the law remains relevant as it aligns with later discoveries in microscopic behavior, such as quantum states. The discussion highlights a common misconception that the law's applicability is limited to the microscopic level. The success of thermodynamics stems from its ability to bridge these scales, demonstrating its robustness as a theory. Understanding this connection is crucial for grasping the full implications of thermodynamic principles.
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Thermodynamics makes good predictions for macroscopic experiments, but the actual physics is going on in the microscopic particular level.

The second law of thermo is often thrown around, usually by people who couldn't explain F=ma back to you.

My question is the way the second law used on the macroscopic scale ever relevant? I mean can it ever be used in a context where the mechanism for it's action is not on the microscopic particular level?
 
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Your thinking is kind of confusing. Initially, thermodynamics was worked out on macroscopic scales, so it must have been relevant. Later, the microscopic aspects (e.g. quantum states) were worked out and supported the macroscopic results. This is why it's such a successful theory.

Do you actually mean something different?
 

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