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Physics is one of the oldest academic disciplines, perhaps the oldest through its inclusion of astronomy. Over the last two millennia, physics was a part of natural philosophy along with chemistry, biology, and certain branches of mathematics, but during the scientific revolution in the 17th century, the natural sciences emerged as unique research programs in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined.
Optics , Materials Physics , Applied Physics , Photonics , Quantum Physics , Electromagnetism , Computational Physics , Atomic, Molecular and Optical Physics , Experimental Physics , Thermodynamics , Solid-state Physics , Mathematical Physics , Fluid Dynamics , Biophysics , Plasma Physics , Particle Physics , Acoustics , Theoretical Physics , Fluid Mechanics , Medical Physics , Condensed Matter Physics , Geophysics , Nuclear Physics , Laser Physics , Chemical Physics , Vehicle Dynamics , Accelerator Physics , Cryogenics , Molecular Physics .