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. Physicists 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 physical phenomena and the analysis of experiments, and theoretical physicists who specialize in mathematical modeling of physical systems to rationalize, explain and predict natural phenomena. Physicists can apply their knowledge towards solving practical problems or to developing new technologies (also known as applied physics or engineering physics).

Here are some famous physicists:

- Albert Einstein
- Archimedes
- Benjamin Franklin
- Blaise Pascal
- Enrico Fermi
- Erwin Schrödinger
- Galileo Galilei
- Henri Poincaré
- Isaac Newton
- James Watt
- Johannes Kepler
- Julius Robert Oppenheimer
- Leó Szilárd
- Marie Curie
- Max Planck
- Niels Bohr
- Nikola Tesla
- Rene Descartes
- Richard Feynman
- Satyendra Nath Bose
- Stephen Hawking
- Werner Heisenberg
- C.V. Raman

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