Philosophy Lexicon of Arguments

Author Item Excerpt Meta data

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I 657
Time Reversal/Movement Reversal/Reversibility/Feynman: E.g. A movie played backwards: here entropy is not as high as you might think, since all elements have exactly the right speed to return to their starting point.

Reversibility/Irreversibility/Physics/Time Inversion/Feynman: E.g. retarded electric field:
t: time, r: distance from the charge: field corresponding to the acceleration at the time t r/c and not t + r/c.
Consequently, it appears that the law of electricity is not reversible.
Vs: but in fact Maxwell's equations are reversible! In addition, we could take the advanced field instead of the retarded field and everything goes the same way. This also means that an oscillating charge in a closed container (black body) will lead to an equilibrium.
I 729
Time Reversal/Time/Backward Movement/Film/Reversibility/Feynman: e.g. movie playing backwards: if we were able to see the individual molecules, we could not see if the machine was moving forward or backward. Nothing contradicts the physical laws.
On the other hand, if we do not see all the details, it will be clearly detectable, e.g. as a forward movement.
For example, if we looked at the individual atoms of an egg, we could not determine whether the egg was bursting or assembling.
At the level of the individual atoms the laws look completely reversible.

R. Feynman
Vom Wesen physikalischer Gesetze München 1993

Fey I
R. Feynman
Vorlesungen über Physik I München 2001

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Ed. Martin Schulz, access date 2017-05-24