Irreversibility

Definition and stakes

Max Planck,  Eight Lectures on Theoretical Physics… (1915)

“ In fact, the motions of single atoms are always reversible, and thus far one may say, as before, that the irreversible processes appear reduced to a reversible process, but the phenomenon as a whole is nevertheless irreversible, because upon reversal the disorder of the numerous individual elementary processes would be eliminated. Irreversibility is inherent, not in the individual elementary processes themselves, but solely in their irregular constitution. ”
Source: Wikisource

Portrait of Edith Wharton Edith Wharton,  Autres Temps

“ Where indeed in this crowded, topsy-turvey world, with its headlong changes and helter-skelter readjustments, its new tolerances and indifferences and accommodations, was there room for a character fashioned by slower sterner processes and a life broken under their inexorable pressure? And then, in a flash, she viewed the chaos from a new angle, and order seemed to move upon the void. If the old processes were changed, her case was changed with them; she, too, was a part of the general readjustment, a tiny fragment of the new pattern worked out in bolder freer harmonies. ”
Source: Gutenberg

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