Max Planck — "The quantum of action, as I called it, was a purely formal assumption and I real…"
The quantum of action, as I called it, was a purely formal assumption and I really did not think much about it.
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Details
Reflecting on the initial, almost accidental, nature of his revolutionary discovery.
Date: Early 20th century, reflecting on 1900
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Understanding this quote
What it means
Planck is admitting that when he first introduced the idea of energy coming in discrete packets, he treated it as a mathematical trick to make his equations work, not as a real physical insight. He didn't grasp that he had stumbled onto something revolutionary. In plain terms: he made a guess to patch a formula and only later realized it had cracked open an entirely new branch of science.
Relevance to Max Planck
Planck spent 1900 trying to solve blackbody radiation and inserted the constant h almost reluctantly, since he was a classical physicist by training and temperament. He resisted the radical implications of his own work for years, hoping quantization could be reconciled with continuous physics. This quote captures his lifelong humility and the irony that a conservative thinker accidentally launched the most disruptive theory of the twentieth century.
The era
Around 1900, classical physics seemed nearly complete, with only small puzzles like the ultraviolet catastrophe left over. Within decades, Planck's reluctant assumption sparked Einstein's photon, Bohr's atom, and the full quantum revolution, all while Europe was upended by two world wars. Planck himself lived through the collapse of imperial Germany, the Nazi era, and the loss of his son Erwin to the Gestapo, watching his quiet equation reshape reality.
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