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Quantum field theory unified quantum mechanics and special relativity. General relativity describes movement in a curved space-time and accurately describes large-mass systems at the level of stars and galaxies in the universe.
It has not yet succeeded in linking general relativity with other theories, but scientists are working on this path, i.e. linking general relativity (which is the theory of very large systems) with quantum theory (which is the theory that describes atomic and subatomic systems) and there are currently several proposed theories of quantum gravity. .
Classical physics includes traditional branches and topics that were well recognized and developed before the beginning of the twentieth century (classical mechanics, acoustics, optics, thermodynamics, and electromagnetism). Classical mechanics is concerned with bodies that act by forces and moving bodies and can be divided into static (the study of forces on an object or bodies that are not subject to acceleration), kinematics (the study of motion without looking at its causes), and dynamics (the study of motion and the forces that affect it); Mechanics can also be divided into solid mechanics and fluid mechanics (collectively known as continuity mechanics), the latter comprising branches such as hydrostatics, hydrodynamics, aerodynamics, and pneumatics. Acoustics is the study of how sound is produced, controlled, transmitted and received.
Important modern branches of acoustics include ultrasound and the study of high-frequency sound waves that exceed the range of human hearing; Vital acoustics, the physics of animal calls and hearing, electroacoustics, and the manipulation of audible sound waves using electronics. Optics, the study of light, relates not only to visible light but also to infrared and ultraviolet rays, which exhibit all phenomena of visible light except for vision, for example, reflection, refraction, interference, diffraction, scattering, and polarization of light. Heat is a form of energy, the internal energy possessed by the particles that make up matter; Thermodynamics deals with the relationships between heat and other forms of energy. Electricity and magnetism have been studied as one branch of physics since the close relationship between them was discovered in the early nineteenth century. An electric current creates a magnetic field, and a changing magnetic field induces an electric current. Electrostatics deals with electric charges during rest, electrodynamics with moving charges, and magnetic electricity with the remaining magnetic poles.
One of the important concepts in classical mechanics is the principles of preserving momentum of motion and energy. This prompted the mathematical reformulation of Newton’s laws of motion in Lagrange Mechanics and Hamilton’s mechanics by adopting this principle. The two mechanical formulas in describing the behavior of bodies stand on the same level of precision, but in a manner independent of the system of forces exerting upon them, which is sometimes impractical in forming an equivalent
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