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  Equation of Continuity: Definition, Derivation, Formula, Physical Meaning and Applications Introduction The Equation of Continuity is one of the most important conservation laws in physics and engineering. It expresses the principle that a physical quantity such as mass, charge, energy, or fluid cannot be created or destroyed within a closed system unless there is a source or sink. In electromagnetics, the continuity equation represents the conservation of electric charge. The continuity equation establishes a mathematical relationship between the current flowing through a region and the rate of change of charge within that region. It ensures that electric charge is conserved at every point in space and time. This equation is widely used in: Electromagnetic field theory Electrical engineering Fluid mechanics Semiconductor devices Plasma physics Antenna theory Communication systems The continuity equation provides a bridge between current density and charge...