Editing Max Planck (section)

=== Professor at Berlin University ===
As a professor at the [[Humboldt University of Berlin|Friedrich-Wilhelms-Universität in Berlin]], Planck joined the local Physical Society. He later wrote about this time: "In those days I was essentially the only theoretical physicist there, whence things were not so easy for me, because I started mentioning entropy, but this was not quite fashionable, since it was regarded as a mathematical spook".<ref>
{{cite journal
 |last1     = Verband Deutscher Elektrotechniker
 |last2     = Elektrotechnischer Verein (Berlin, Germany)
 |year      = 1948
 |journal   = ETZ: Elektrotechnische Zeitschrift
 |title     = ETZ: Elektrotechnische Zeitschrift: Ausg. A.
 |volume    = 69
 |issue     = A
 |publisher = VDE-Verlag
 |language  = de
 |url       = https://books.google.com/books?id=ZFE7AAAAMAAJ
}}, [https://www.google.com/search?&tbs=bks%3A1&q=planck++%22damals+der+einzige+theoretische%22 Snipped extract] {{Webarchive|url=https://web.archive.org/web/20170405025654/http://www.google.com/search?&tbs=bks%3A1&q=planck++%22damals+der+einzige+theoretische%22 |date=5 April 2017 }}</ref> Thanks to his initiative, the various local Physical Societies of Germany merged in 1898 to form the German Physical Society ([[Deutsche Physikalische Gesellschaft]], DPG); from 1905 to 1909 Planck was the president.

[[File:Max Planck Wirkungsquantums 20050815.jpg|thumb|right|Plaque at the [[Humboldt University of Berlin]]: "Max Planck, discoverer of the elementary quantum of action ''h'', taught in this building from 1889 to 1928."]]

Planck started a six-semester course of lectures on theoretical physics, "dry, somewhat impersonal"{{Citation needed|date=March 2025}} according to [[Lise Meitner]], "using no notes, never making mistakes, never faltering; the best lecturer I ever heard"{{Citation needed|date=March 2025}} according to an English participant, [[J. R. Partington|James R. Partington]], who continues: "There were always many standing around the room. As the lecture-room was well heated and rather close, some of the listeners would from time to time drop to the floor, but this did not disturb the lecture."{{Citation needed|date=March 2025}} Planck did not establish an actual "school"; the number of his graduate students was only about 20, among them:{{Citation needed|date=March 2025}}
* 1897 [[Max Abraham]] (1875–1922)
* 1903 [[Max von Laue]] (1879–1960)
* 1904 [[Moritz Schlick]] (1882–1936)
* 1906 [[Walther Meissner]] (1882–1974)
* 1907 [[Fritz Reiche]] (1883–1960)
* 1912 [[Walter Schottky]] (1886–1976)
* 1914 [[Walther Bothe]] (1891–1957)<ref>{{cite web|url=https://www.genealogy.math.ndsu.nodak.edu/id.php?id=20750|title=Max Planck – The Mathematics Genealogy Project|website=www.genealogy.math.ndsu.nodak.edu|access-date=5 June 2017|archive-url=https://web.archive.org/web/20170608023459/https://www.genealogy.math.ndsu.nodak.edu/id.php?id=20750|archive-date=8 June 2017|url-status=live}}</ref>