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If someone points out to you that your pet theory of the universe is in disagreement with Maxwell's equations - then so much the worse for Maxwell's equations. If it is found to be contradicted by observation - well, these experimentalists do bungle things sometimes. But if your theory is found to be against the second law of thermodynamics I can give you no hope; there is nothing for it but to collapse in deepest humiliation.

Arthur Stanley Eddington#16

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About this quote

What does it mean?
A theory contradicting Maxwell's equations or experiments might be defended, but one violating the second law of thermodynamics is hopeless.
In plain terms
Ignore Maxwell or experiments if needed, but never break the second law of thermodynamics.
What can you take from it?
The second law of thermodynamics is the most secure constraint for physical theories.

Where it applies

  • evaluating theories
  • debating validity
  • teaching thermodynamics

Putting it to work

  • prioritize thermodynamic consistency
  • assess theoretical claims
  • teach limits

Questions to consider

  • What makes a law fundamental?
  • Are all laws revisable?

Another view

Even thermodynamics has been questioned in extreme or quantum contexts.

More from Arthur Stanley Eddington

  1. Shuffling is the only thing which Nature cannot undo.

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  2. Never mind what two tons refers to. What is it? How has it entered in so definite a way into our exprerience? Two tons is the reading of the pointer when the e…

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  3. Motion with respect to the universal ocean of aether eludes us. We say, 'Let V be the velocity of a body through the aether', and form the various electromagne…

    Permalink to quote #14

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