Relativity is a branch of physics that refers to two theories, general relativity and special relativity by Albert EinsteinGeneral relativity explains the law of gravitation and its relation to other forces of nature. Special relativity applies to elementary particles and their interactions, describing all their physical phenomena except gravity.

Nomenclature & Symbols for Engineering, Mathematics, and Scienceor 

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Atmospheric Pressure
Center of Mass
Centripetal Force
Free Fall
Relativistic Energy
Relativistic Mass
Relativistic Momentum
Time of Flight
Universal Gravitational Constant