physicist
Sign in to savethumb|upright|Albert Einstein, a key theoretical physicist in the twentieth century who developed the [[theory of relativity and parts of early quantum theory ]]
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A physicist is a scientist who studies matter, energy, and the forces that govern how the physical world works. Understanding physics matters because it helps us explain natural phenomena and has led to major discoveries and technologies that shape modern life.
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thumb|upright|Albert Einstein, a key theoretical physicist in the twentieth century who developed the [[theory of relativity and parts of early quantum theory ]]
A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate causes of phenomena, and usually frame their understanding in mathematical terms. They work across a wide range of research fields, spanning all length scales: from sub-atomic and particle physics, through biological physics, to cosmological length scales encompassing the universe as a whole. The field generally includes two types of physicists: experimental physicists who specialize in the observation of natural phenomena and the development and analysis of experiments, and theoretical physicists who specialize in mathematical modeling of physical systems to rationalize, explain and predict natural phenomena.