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[[Nuclear fission]] was discovered in December 1938 by chemists [[Otto Hahn]] and [[Fritz Strassmann]] and physicists [[Lise Meitner]] and ...d. Hahn suggested a bursting of the nucleus, but he was unsure of what the physical basis for the results were. They reported their findings by mail to Meitner ...

...SI system]] after the 2019 definition: Base units as defined in terms of [[physical constant]]s and other base units. Here, <math>a \rightarrow b</math> means ...[[International System of Quantities]] were redefined in terms of natural physical constants, rather than human artefacts such as the [[International Prototyp ...

...However, by about 1880 support for Van 't Hoff's theory by such important chemists as [[Johannes Wislicenus]] and [[Viktor Meyer]] brought recognition. ==== Foundations of modern physical chemistry (1880s) ==== ...