Beginning with the first issue in 1915, PNAS has showcased a rich variety of physics research. PNAS has published a range of such work, including Robert Millikan’s experimental exploration of the photoelectric effect , Edwin Hubble’s theory of the expanding universe , Albert Einstein and Willem de Sitter’s calculations of the density of the universe , and Francis Murnaghan’s equation of state describing the behavior of fluids under compression .
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(1) Millikan, R. A. and Souder, W. H. “Experimental Evidence for the Essential Identity of the Selective and Normal Photoelectric Effects”, PNAS 2, 19 (1916)
(2) Hubble, Edwin "A Relation Between Distance and Radial Velocity Among Extra-Galactic Nebulae", PNAS 15, 168, (1929)
(3) Einstein, A. and de-Sitter,W., "On the Relation Between the Expansion and the Mean Density of the Universe", PNAS 18, 213, (1932)
(4) Murnaghan, F. D. “The Compressibility of Media Under Extreme Pressures”, PNAS 30, 244 (1944)