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Continuity of equation or Equation of continuity

Define Equation of continuity or Continuity of equation: An equation that states that a fluid flowing via a pipe flows at a rate that is inversely proportional to the cross-sectional region of the pipe. That is, when the pipe constricts, the fluid flows faster; when it widens, the fluid flows slower. This is in essence a restatement of the conservation of mass throughout constant flow.

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