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What is physics? ArticleMediaAdditional Info HomeSciencePhysics Physics science Cite Share More WRITTEN BY Laurie M. Brown See All Contributors Emeritus Professor of Physics and Astronomy, Northwestern University, Evanston, Illinois. Coeditor of The Birth of Particle Physics. See Article History Physics, science that deals with the structure of matter and the interactions between the fundamental constituents of the observable universe. In the broadest sense, physics (from the Greek physikos) is concerned with all aspects of nature on both the macroscopic and submicroscopic levels. Its scope of study encompasses not only the behaviour of objects under the action of given forces but also the nature and origin of gravitational, electromagnetic, and nuclear force fields. Its ultimate objective is the formulation of a few comprehensive principles that bring together and explain all such disparate phenomena.   Bernoulli model of gas pressure As conceived by Daniel Bernoulli in Hydrodynamica