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1920 in science
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==Physics== * [[Megh Nad Saha]] states his ionization equation. * [[Albert Einstein]] delivers his [[Leiden Lecture]]. * [[Ernest Rutherford]] predicts the existence of the [[neutron]]. * [[James Jeans]] discovers that the dynamical constants of motion determine the distribution function for a system of particles. * Publication of [[Alan Arnold Griffith|Alan A. Griffith]]'s analysis of the process of [[brittle fracture]].<ref>{{cite journal|title=The Phenomenon of Rupture and Flow in Solids|jstor=91192|journal=[[Philosophical Transactions of the Royal Society]]|volume=A221|issue=582β593|pages=163β98|date=February 1920|doi=10.1098/rsta.1921.0006|bibcode=1921RSPTA.221..163G|last1=Griffith|first1=A. A.|hdl=2027/uiug.30112007702761|doi-access=free}}</ref>
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